Chains and heterogens:
PDB Chain Sequences:
>1iz9A (A:) mkapvrvavtgaagqigysllfriaagemlgkdqpvilqlleipqamkalegvvmeledc afpllagleatddpkvafkdadyallvgaaprkagmerrdllqvngkifteqgralaeva kkdvkvlvvgnpantnaliayknapglnprnftamtrldhnrakaqlakktgtgvdrirr mtvwgnhsstmfpdlfhaevdgrpalelvdmewyekvfiptvaqrgaaiiqargassaas aanaaiehirdwalgtpegdwvsmavpsqgeygipegivysfpvtakdgayrvveglein efarkrmeitaqelldemeqvkalgli
>1iz9B (B:) mkapvrvavtgaagqigysllfriaagemlgkdqpvilqlleipqamkalegvvmeledc afpllagleatddpkvafkdadyallvgaaprkagmerrdllqvngkifteqgralaeva kkdvkvlvvgnpantnaliayknapglnprnftamtrldhnrakaqlakktgtgvdrirr mtvwgnhsstmfpdlfhaevdgrpalelvdmewyekvfiptvaqrgaaiiqargassaas aanaaiehirdwalgtpegdwvsmavpsqgeygipegivysfpvtakdgayrvveglein efarkrmeitaqelldemeqvkalgli