PTBP1 GI:28558998 polypyrimidine tract-binding protein 1 isoform d 1 mdgivpdiav gtkrvtpqsl filfgvygdv qrvkilfnkk enalvqmadg 50 51 nqaqlamshl nghklhgkpi ritlskhqnv qlpregqedq gltkdygnsp 100 101 lhrfkkpgsk nfqnifppsa tlhlsnipps vseedlkvlf ssnggvvkgf 150 151 kffqkdrkma liqmgsveea vqalidlhnh dlgenhhlrv sfsksti