Peptide sequence: NATPLDFPSK KRKRSRWNQD TMEQKTVIPG MPTVIPPGLT REQERAYIVQ Sequence homology: Cow: 100%; Dog: 100%; Guinea Pig: 100%; Horse: 100%; Human: 100%; Mouse: 100%; Rabbit: 100%; Rat: 100%; Zebrafish: 86%. Splicing factor 1 is a nuclear pre-mRNA sp