Chains and heterogens:
PDB Chain Sequences:
>1mrg_ (-) dvsfrlsgadprsygmfikdlrnalpfrekvyniplllpsvsgagryllmhlfnrdgkti tvavdvtniyimgyladttsyffnepaaelasqyvfrdarrkitlpysgdyerlqiaagk prekipiglpaldsaistllhydstaaagallvliqttaeaarfkyieqqiqerayrdev pslatislenswsglskqiqlaqgnngifrtpivlvdnkgnrvqitnvtskvvtsniqll lntrni