poly(A) tail of mRNA stars with C?

Question

[sun9700]

take NM_001135041.2 for example:

polyA_site 4148 /gene="DCTN1" /gene_synonym="DAP-150; DP-150; P135"

But nt at 4148 is C! : caa aaaaaaaaaa aaaaaa

while some don't have a polyA tail: NM_001012632, some seems to be wrong annotated:NM_001012632

Answer 1

[natasha.sernova]

See this detailed description:

https://quizlet.com/103779909/chapter-142-eukaryotic-pre-mrna-processing-flash-cards/