Chains and heterogens:
PDB Chain Sequences:
>1r2jA (A:) mperdalltdlvgdraaewdtsgelprdllvrlgadgllcaevaaehgglglgsrengef tahvgslcsslrsvmtsqgmaawtvqrlgdagqratflkeltsgklaavgfserqagsdl samrtrvrldgdtavvdghkvwttaaayadhlvvfglqedgsgavvvvpadtpgvrverv pkpsgcraaghadlhldqvrvpagavlagsgaslpmlvaaslaygrksvawgcvgilrac rtaavahartreqfgrplgdhqlvaghiadlwtaeqiaarvceyasdhwdegspemvpat ilakhvaaeraaagaataaqvlasagareghvverayrdaklmeiiegssemcrvmlaqh alalpa
>1r2jA (A:) erdalltdlvgdraaewdtsgelprdllvrlgadgllcaevaaehgglglgsrengefta hvgslcsslrsvmtsqgmaawtvqrlgdagqratflkeltsglaavgfserqagsdlsam rtrvrldgdtavvdghkvwttaaayadhlvvfglqedgsgavvvvpadtpgvrvervpkp sgcraaghadlhldqvrvpagavlagsgaslpmlvaaslaygrksvawgcvgilracrta avahartreqfgrplgdhqlvaghiadlwtaeqiaarvceyasdhmvpatilakhvaaer aaagaataaqvlasagaghvverayrdaklmeiiegssemcrvmlaqhalalp