Chains and heterogens:
PDB Chain Sequences:
>2f90A (A:) mskyklimlrhgegawnkenrfcswvdqklnsegmeearncgkqlkalnfefdlvftsvl nrsihtawlileelgqewvpvesswrlnerhygaliglnreqmalnhgeeqvrlwrrsyn vtpppieeshpyyqeiyndrrykvcdvpldqlprseslkdvlerllpywneriapevlrg ktilisahgnssrallkhlegisdediinitlptgvpilleldenlravgphqflgdqea iqaaikkvedqgkvkqakklehhhhhh
>2f90A (A:) kyklimlrhgegawnkenrfcswvdqklnsegmeearncgkqlkalnfefdlvftsvlnr sihtawlileelgqewvpvesswrlnerhygaliglnreqmalnhgeeqvrlwrrsynvt pppieeshpyyqeiyndrrykvcdvpldqlprseslkdvlerllpywneriapevlrgkt ilisahgnssrallkhlegisdediinitlptgvpilleldenlravgphqflgdqeaiq aaikkvedqgkvkq
>2f90B (B:) mskyklimlrhgegawnkenrfcswvdqklnsegmeearncgkqlkalnfefdlvftsvl nrsihtawlileelgqewvpvesswrlnerhygaliglnreqmalnhgeeqvrlwrrsyn vtpppieeshpyyqeiyndrrykvcdvpldqlprseslkdvlerllpywneriapevlrg ktilisahgnssrallkhlegisdediinitlptgvpilleldenlravgphqflgdqea iqaaikkvedqgkvkqakklehhhhhh
>2f90B (B:) kyklimlrhgegawnkenrfcswvdqklnsegmeearncgkqlkalnfefdlvftsvlnr sihtawlileelgqewvpvesswrlnerhygaliglnreqmalnhgeeqvrlwrrsynvt pppieeshpyyqeiyndrrykvcdvpldqlprseslkdvlerllpywneriapevlrgkt ilisahgnssrallkhlegisdediinitlptgvpilleldenlravgphqflgdqeaiq aaikkvedqgkvk