diff --git a/pyaptamer/pseaac/_props.py b/pyaptamer/pseaac/_props.py
index a05c4b90..e8d4f2e6 100644
--- a/pyaptamer/pseaac/_props.py
+++ b/pyaptamer/pseaac/_props.py
@@ -608,473 +608,6 @@ def aa_props(prop_indices=None, type="numpy", normalize=True):
         ]
     ).T  # shape (20, 21)
 
-    if normalize:
-        props = np.array(
-            [
-                [
-                    0.636,
-                    0.298,
-                    -0.924,
-                    -0.759,
-                    1.221,
-                    0.493,
-                    -0.41,
-                    1.416,
-                    -1.539,
-                    1.088,
-                    0.657,
-                    -0.8,
-                    0.123,
-                    -0.872,
-                    -2.596,
-                    -0.185,
-                    -0.051,
-                    1.108,
-                    0.831,
-                    0.267,
-                ],
-                [
-                    -0.152,
-                    -0.418,
-                    1.713,
-                    1.713,
-                    -1.218,
-                    0.115,
-                    -0.152,
-                    -0.845,
-                    1.713,
-                    -0.845,
-                    -0.578,
-                    0.221,
-                    0.115,
-                    0.221,
-                    1.713,
-                    0.274,
-                    -0.099,
-                    -0.685,
-                    -1.697,
-                    -1.111,
-                ],
-                [
-                    -1.592,
-                    -0.53,
-                    -0.131,
-                    0.334,
-                    0.931,
-                    -2.057,
-                    0.632,
-                    -0.198,
-                    0.334,
-                    -0.198,
-                    0.4,
-                    -0.164,
-                    -0.696,
-                    0.3,
-                    1.263,
-                    -1.061,
-                    -0.596,
-                    -0.662,
-                    2.226,
-                    1.462,
-                ],
-                [
-                    0.329,
-                    1.417,
-                    -0.487,
-                    1.417,
-                    -1.303,
-                    0.057,
-                    -0.215,
-                    1.036,
-                    1.689,
-                    -0.922,
-                    -0.65,
-                    0.166,
-                    -0.704,
-                    0.166,
-                    1.689,
-                    0.22,
-                    -0.16,
-                    -0.759,
-                    -1.792,
-                    -1.194,
-                ],
-                [
-                    1.755,
-                    0.429,
-                    -1.365,
-                    0.195,
-                    -0.585,
-                    1.365,
-                    -1.287,
-                    0.039,
-                    0.819,
-                    1.287,
-                    -1.521,
-                    -0.039,
-                    -0.429,
-                    -0.507,
-                    -0.351,
-                    1.131,
-                    0.507,
-                    0.897,
-                    -1.755,
-                    -0.585,
-                ],
-                [
-                    -0.659,
-                    -1.007,
-                    0.593,
-                    -1.633,
-                    0.697,
-                    -0.416,
-                    -0.277,
-                    1.671,
-                    -0.798,
-                    0.836,
-                    0.176,
-                    -1.32,
-                    -1.355,
-                    -0.068,
-                    -0.52,
-                    -0.277,
-                    0.628,
-                    2.297,
-                    0.628,
-                    0.802,
-                ],
-                [
-                    0.735,
-                    -0.968,
-                    1.372,
-                    -1.341,
-                    1.108,
-                    -0.023,
-                    -0.704,
-                    1.273,
-                    -0.166,
-                    1.141,
-                    0.955,
-                    -0.924,
-                    -0.77,
-                    -1.429,
-                    -1.924,
-                    -0.276,
-                    0.021,
-                    1.196,
-                    0.746,
-                    -0.023,
-                ],
-                [
-                    0.219,
-                    1.552,
-                    -0.811,
-                    0.69,
-                    -1.427,
-                    0.575,
-                    -0.314,
-                    -1.42,
-                    1.335,
-                    -1.554,
-                    -1.281,
-                    1.087,
-                    1.08,
-                    0.662,
-                    0.212,
-                    0.697,
-                    0.686,
-                    -1.247,
-                    0.117,
-                    -0.857,
-                ],
-                [
-                    0.56,
-                    1.13,
-                    -1.484,
-                    2.509,
-                    -0.975,
-                    0.933,
-                    -0.696,
-                    -0.722,
-                    1.645,
-                    -0.181,
-                    -0.991,
-                    0.158,
-                    -0.067,
-                    0.076,
-                    0.592,
-                    0.13,
-                    0.114,
-                    -0.453,
-                    -1.411,
-                    -0.867,
-                ],
-                [
-                    -0.479,
-                    -0.663,
-                    0.09,
-                    -0.654,
-                    1.271,
-                    -1.153,
-                    -0.479,
-                    1.516,
-                    0.195,
-                    0.658,
-                    0.221,
-                    -1.161,
-                    1.183,
-                    -1.24,
-                    -0.496,
-                    -1.179,
-                    -1.179,
-                    0.396,
-                    2.058,
-                    1.096,
-                ],
-                [
-                    0.253,
-                    -0.338,
-                    -0.836,
-                    -0.061,
-                    -0.836,
-                    0.548,
-                    -0.522,
-                    -0.541,
-                    0.548,
-                    -0.947,
-                    -0.928,
-                    0.345,
-                    3.703,
-                    -0.227,
-                    0.031,
-                    0.474,
-                    0.696,
-                    -0.725,
-                    -0.614,
-                    -0.024,
-                ],
-                [
-                    -0.223,
-                    1.256,
-                    -0.163,
-                    -0.042,
-                    -0.797,
-                    1.588,
-                    -0.254,
-                    -1.008,
-                    -0.495,
-                    -1.189,
-                    -1.219,
-                    1.98,
-                    2.04,
-                    -0.133,
-                    0.048,
-                    0.743,
-                    0.169,
-                    -1.159,
-                    -0.948,
-                    -0.193,
-                ],
-                [
-                    -0.277,
-                    -1.356,
-                    0.311,
-                    -1.037,
-                    0.532,
-                    -1.037,
-                    -0.253,
-                    1.905,
-                    -0.816,
-                    0.655,
-                    0.385,
-                    -1.062,
-                    -1.552,
-                    -0.203,
-                    -0.253,
-                    -0.522,
-                    0.213,
-                    1.905,
-                    1.243,
-                    1.219,
-                ],
-                [
-                    -0.187,
-                    -0.393,
-                    0.397,
-                    -2.352,
-                    1.221,
-                    -0.393,
-                    -0.496,
-                    1.805,
-                    -0.703,
-                    0.843,
-                    0.947,
-                    -1.012,
-                    -0.909,
-                    0.569,
-                    -1.184,
-                    -0.84,
-                    0.74,
-                    1.359,
-                    0.397,
-                    0.191,
-                ],
-                [
-                    -0.402,
-                    -1.503,
-                    0.469,
-                    -1.119,
-                    0.443,
-                    -1.273,
-                    0.161,
-                    1.237,
-                    -0.812,
-                    0.52,
-                    0.085,
-                    -1.119,
-                    -1.631,
-                    0.315,
-                    -0.095,
-                    -0.479,
-                    0.622,
-                    1.211,
-                    1.775,
-                    1.595,
-                ],
-                [
-                    -0.078,
-                    -0.667,
-                    -2.081,
-                    -0.562,
-                    -0.401,
-                    -0.097,
-                    0.907,
-                    -0.066,
-                    2.24,
-                    -0.091,
-                    -0.24,
-                    -0.444,
-                    0.108,
-                    -0.295,
-                    2.872,
-                    -0.277,
-                    -0.289,
-                    -0.103,
-                    -0.147,
-                    -0.289,
-                ],
-                [
-                    1.728,
-                    -0.604,
-                    -0.7,
-                    -1.671,
-                    -1.152,
-                    1.25,
-                    -0.292,
-                    -0.273,
-                    -0.47,
-                    -0.273,
-                    -0.082,
-                    0.008,
-                    2.445,
-                    -0.534,
-                    1.371,
-                    0.333,
-                    -0.097,
-                    0.097,
-                    0.218,
-                    -1.302,
-                ],
-                [
-                    -0.025,
-                    -1.322,
-                    -1.322,
-                    -1.249,
-                    1.601,
-                    -0.81,
-                    -0.335,
-                    1.291,
-                    -1.194,
-                    1.382,
-                    0.852,
-                    -0.847,
-                    0.871,
-                    -0.189,
-                    -0.993,
-                    -0.573,
-                    -0.098,
-                    0.779,
-                    1.273,
-                    0.907,
-                ],
-                [
-                    0.549,
-                    -1.863,
-                    0.137,
-                    0.173,
-                    -2.131,
-                    0.111,
-                    0.152,
-                    0.131,
-                    0.853,
-                    0.147,
-                    -0.946,
-                    1.167,
-                    0.229,
-                    1.059,
-                    2.172,
-                    0.147,
-                    0.126,
-                    0.085,
-                    -1.116,
-                    -1.183,
-                ],
-                [
-                    -0.099,
-                    1.717,
-                    -0.227,
-                    -0.277,
-                    2.339,
-                    -0.385,
-                    0.009,
-                    -0.223,
-                    -0.857,
-                    -0.231,
-                    0.82,
-                    -1.081,
-                    -0.289,
-                    -0.976,
-                    -1.996,
-                    -0.358,
-                    -0.281,
-                    -0.18,
-                    1.431,
-                    1.145,
-                ],
-                [
-                    -0.2,
-                    1.276,
-                    -0.28,
-                    -0.348,
-                    2.725,
-                    -0.052,
-                    0.578,
-                    -0.28,
-                    -0.602,
-                    -0.28,
-                    0.538,
-                    -0.576,
-                    -0.254,
-                    -0.482,
-                    -1.126,
-                    -0.71,
-                    -0.495,
-                    -0.254,
-                    2.215,
-                    -1.394,
-                ],
-            ]
-        ).T  # shape (20, 21)
 
     if prop_indices is not None:
         props = props[:, prop_indices]
@@ -1082,9 +615,12 @@ def aa_props(prop_indices=None, type="numpy", normalize=True):
     else:
         selected_names = prop_names
 
+    if normalize:
+        props = (props - props.mean(axis=0)) / props.std(axis=0)
+
     if type == "pandas":
         return pd.DataFrame(props, index=aa_order, columns=selected_names)
     elif type == "numpy":
         return props
     else:
-        raise ValueError("type must be 'numpy' or 'pandas'")
+        raise ValueError("type must be 'numpy' or 'pandas'")
\ No newline at end of file