Chains and heterogens:
PDB Chain Sequences:
>1vkxA (A:) ayveiieqpkqrgmrfrykcegrsagsipgerstdttkthptikingytgpgtvrislvt kdpphrphphelvgkdcrdgyyeadlcpdrsihsfqnlgiqcvkkrdleqaisqriqtnn npfhvpieeqrgdydlnavrlcfqvtvrdpagrpllltpvlshpifdnrapntaelkicr vnrnsgsclggdeifllcdkvqkedievyftgpgweargsfsqadvhrqvaivfrtppya dpslqapvrvsmqlrrpsdrelsepmefqylpd
>1vkxB (B:) gpylqileqpkqrgfrfryvcegpshgglpgasseknkksypqvkicnyvgpakvivqlv tngknihlhahslvgkhcedgvctvtagpkdmvvgfanlgilhvtkkkvfetlearmtea cirgynpgllvhsdlaylqaegggdrqltdrekeiirqaavqqtkemdlsvvrlmftafl pdstgsftrrlepvvsdaiydskapnasnlkivrmdrtagcvtggeeiyllcdkvqkddi qirfyeeeenggvwegfgdfsptdvhrqfaivfktpkykdvnitkpasvfvqlrrksdle tsepkpflyype