>5nt1B (B:) SEQRES residues gpgtmasvpasryltdmtleemsrewsmlipkqkvagplcirmdqaimdkniilkanfsv ifdrletlillrafteegaivgeisplpslpghtaedvknavgvligglewndntvrvse tlqrfawrssnengrppltpkqkremagtirsev