Chains and heterogens:
PDB Chain Sequences:
>1nf9A (A:) msgipeitayplptaqqlpanlarwsleprravllvhdmqryflrplpeslraglvanaa rlrrwcveqgvqiaytaqpgsmteeqrgllkdfwgpgmraspadrevveelapgpddwll tkwrysaffhsdllqrmraagrdqlvlcgvyahvgvlistvdaysndiqpflvadaiadf seahhrmaleyaasrcamvvttdevle