Returns the number of sequence in an MSA alignment.
## S3 method for class 'msa'
an MSA object
an integer containing the number of sequences in an alignment.
Melissa J. Hubisz and Adam Siepel
m <- msa(seqs=c("A--ACGTAT", "AG-AGGTAA", "AGGAGGTAG"),
names=c("human", "mouse", "rat"))
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