[Right Wing Professor]

Andrew, a sequence of 263 amino acids is one termination or initiation codon different from a sequence of 194. I know very little about S4, but I'm willing to bet the extra amino acids, in species where they're present, are deleted in post-translation processing.

[AndrewC]

Andrew, a sequence of 263 amino acids is one termination or initiation codon different from a sequence of 194. I know very little about S4, but I'm willing to bet the extra amino acids, in species where they're present, are deleted in post-translation processing.

That may be so, but then the whole sequence might be considered an intron.