Chains and heterogens:
PDB Chain Sequences:
>1vfn_ (-) gytyedyqdtakwllshteqrpqvavicgsglgglvnkltqaqtfdyseipnfpestvpg hagrlvfgilngracvmmqgrfhmyegypfwkvtfpvrvfrllgvetlvvtnaagglnpn fevgdimlirdhinlpgfsgqnplrgpneerfgvrfpamsdaydrdmrqkahstwkqmge qrelqegtyvmlggpnfetvaecrllrnlgadavgmstvpevivarhcglrvfgfslitn kvimdyesqgkanheevleagkqaaqkleqfvsllmasi
>1vfn_ (-) gytyedyqdtakwllshteqrpqvavicgsglgglvnkltqaqtfdyseipnfpegrlvf gilngracvmmqgrfhmyegypfwkvtfpvrvfrllgvetlvvtnaagglnpnfevgdim lirdhinlpgfsgqnplrgpneerfgvrfpamsdaydrdmrqkahstwkqmgeqrelqeg tyvmlggpnfetvaecrllrnlgadavgmstvpevivarhcglrvfgfslitnkvimdsq gkanheevleagkqaaqkleqfvsllmasi