Chains and heterogens:
PDB Chain Sequences:
>4ra2A (A:) gafldkpkmekhnaqgqgnglryglssmqgwrvemedahtaviglpsgleswsffavydg hagsqvakyccehlldhitnnqdfkgsagapsvenvkngirtgfleidehmrvmsekkhg adrsgstavgvlispqhtyfincgdsrgllcrnrkvhfftqdhkpsnplekeriqnaggs vmiqrvngslavsralgdfdykcvhgkgpteqlvspepevhdierseeddqfiilacdgi wdvmgneelcdfvrsrlevtddlekvcnevvdtclykgsrdnmsvilicfpnapkvspea vkkeaeldkylecrveeiikkqgegvpdlvhvmrtlasenipslppggelaskrnvieav ynrlnpy
>4ra2A (A:) gafldkpkmekhnaqgqgnglryglssmqgwrvemedahtaviglpsgleswsffavydg hagsqvakyccehlldhitnnqdfkgsagapsvenvkngirtgfleidehmrvmsekkhg adrsgstavgvlispqhtyfincgdsrgllcrnrkvhfftqdhkpsnplekeriqnaggs vmiqrvngslavsralgdfdykcvhgkgpteqlvspepevhdierseeddqfiilacdgi wdvmgneelcdfvrsrlevtddlekvcnevvdtclykgsrdnmsvilicfpnapkvspea vkkeaeldkylecrveeiikgvpdlvhvmrtlasenipslppggelaskrnvieavynrl npy