Chains and heterogens:
PDB Chain Sequences:
>1ib2A (A:) grsrlledfrnnrypnlqlreiaghimefsqdqhgsrfiqlkleratpaerqlvfneilq aayqlmvdvfgnyviqkffefgsleqklalaerirghvlslalqmygcrviqkalefips dqqnemvreldghvlkcvkdqngnhvvqkciecvqpqslqfiidafkgqvfalsthpygc rviqrilehclpdqtlpileelhqhteqlvqdqygnyviqhvlehgrpedkskivaeirg nvlvlsqhkfasnvvekcvthasrteravlidevctmndgphsalytmmkdqyanyvvqk midvaepgqrkivmhkirphiatlrkytygkhilaklekyymkngvdlg
>1ib2A (A:) grsrlledfrnnrypnlqlreiaghimefsqdqhgsrfiqlkleratpaerqlvfneilq aayqlmvdvfgnyviqkffefgsleqklalaerirghvlslalqmygcrviqkalefips dqqnemvreldghvlkcvkdqngnhvvqkciecvqpqslqfiidafkgqvfalsthpygc rviqrilehclpdqtlpileelhqhteqlvqdqygnyviqhvlehgrpedkskivaeirg nvlvlsqhkfasnvvekcvthasrteravlidevctmndgphsalytmmkdqyanyvvqk midvaepgqrkivmhkirphia