Chains and heterogens:
PDB Chain Sequences:
>1nunA (A:) grhvrsynhlqgdvrwrklfsftkyflkiekngkvsgtkkencpysileitsveigvvav kainsnyylamnkkgklygskefnndcklkerieengyntyasfnwqhngrqmyvalngk gaprrgqktrrkntsahflpmvvhs
>1nunA (A:) synhlqgdvrwrklfsftkyflkiekngkvsgtkkencpysileitsveigvvavkains nyylamnkkgklygskefnndcklkerieengyntyasfnwqhngrqmyvalngkgaprr gqktrrkntsahflpmvvh
>1nunB (B:) aedfvsensnnkrapywtntekmekrlhavpaantvkfrcpaggnpmptmrwlkngkefk qehriggykvrnqhwslimesvvpsdkgnytcvveneygsinhtyhldvversphrpilq aglpanastvvggdvefvckvysdaqphiqwikhvekngskygpdglpylkvlkhsgins snaevlalfnvteadageyickvsnyigqanqsawltvlpkqqapgreke
>1nunB (B:) krapywtntekmekrlhavpaantvkfrcpaggnpmptmrwlkngkefkqehriggykvr nqhwslimesvvpsdkgnytcvveneygsinhtyhldvversphrpilqaglpanastvv ggdvefvckvysdaqphiqwikhvekngskygpdglpylkvlkhsginssnaevlalfnv teadageyickvsnyigqanqsawltvlp