>2n2k_A mol:protein length:76 ubiquitin MQIFVKTLTGKTITLEVEPSDTIECVKAKIQDKEGIPPDQQRLIFAGCQLEDGRTLSDYNIQKESTLHLVLRLRGG >2n2k_B mol:protein length:71 ubiquitin MQIFVKTLTGKTITLEVEPSDTIENVKAKIQDKEGIPPDQQRLIFAGKQLEDGRTLSDYNIQKESTLHLVL