Chains and heterogens:
PDB Chain Sequences:
>1tca_ (-) lpsgsdpafsqpksvldagltcqgaspssvskpillvpgtgttgpqsfdsnwiplstqlg ytpcwispppfmlndtqvnteymvnaitalyagsgnnklpvltwsqgglvaqwgltffps irskvdrlmafapdykgtvlagpldalavsapsvwqqttgsalttalrnaggltqivptt nlysatdeivqpqvsnspldssylfngknvqaqavcgplfvidhagsltsqfsyvvgrsa lrsttgqarsadygitdcnplpandltpeqkvaaaallapaaaaivagpkqncepdlmpy arpfavgkrtcsgivtp