R CMD check after renaming 3dalign to pdbs

In R CMD check:

> ### Name: pca.pdbs
> ### Title: Principal Component Analysis
> ### Aliases: pca.pdbs
> ### Keywords: utilities multivariate
> 
> ### ** Examples
> 
> 
> attach(transducin)
> 
> #-- Do PCA ignoring gap containing positions
> pc.xray <- pca(pdbs)
Error in UseMethod("pca") : 
  no applicable method for 'pca' applied to an object of class "c('3dalign', 'fasta')"
Calls: pca
Execution halted

want to rename the pdbs "3dalign" object to "pdbs"?

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