Chains and heterogens:
PDB Chain Sequences:
>1y4iA (A:) msdcrtygfntqivhagqqpdpstgalstpifqtstfvfdsaeqgaarfaleesgyiytr lgnpttdalekklavlergeaglatasgisaitttlltlcqqgdhivsasaiygcthafl shsmpkfginvrfvdagkpeeiraamrpetkvvyietpanptlslvdietvagiahqqga llvvdntfmspycqqplqlgadivvhsvtkyinghgdviggiivgkqefidqarfvglkd itggcmspfnawltlrgvktlgirmerhcenalkiarfleghpsitrvyypglsshpqye lgqrqmslpggiisfeiaggleagrrminsvelcllavslgdtetliqhpasmthspvap eerlkagitdglirlsvgledpediindlehairkatf
>1y4iA (A:) sdcrtygfntqivhagqqpdpstgalstpifqtstfvfdsaeqgaarfaleesgyiytrl gnpttdalekklavlergeaglatasgisaitttlltlcqqgdhivsasaiygcthafls hsmpkfginvrfvdagkpeeiraamrpetkvvyietpanptlslvdietvagiahqqgal lvvdntfmspycqqplqlgadivvhsvtkyinghgdviggiivgkqefidqarfvglkdi tggcmspfnawltlrgvktlgirmerhcenalkiarfleghpsitrvyypglsshpqyel gqrqmslpggiisfeiaggleagrrminsvelcllavslgdtetliqhpasmthspvape erlkagitdglirlsvgledpediindlehairkatf