update of the seurat chapter#160

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Commits on May 21, 2019

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sballereau
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fixed typos and replied to comment on accessing variable features for dimension reduction.
Stephane Ballereau
committed
fixed typos and replied to comment on accessing variable features for dimension reduction.
Stephane Ballereau
committed
switched path back.
Stephane Ballereau
committed
seurat.Rmd: fixed typos
Stephane Ballereau
committed
seurat.Rmd: changed path back.
Stephane Ballereau
committed