(S (S (S (NP (BASENP (NNS Doctors)) (PP (IN in) (BASENP (NNP Ural) (NN city)))) (VP (MD would) (VP (VB have) (S (VP (TO to) (VP (VB remove) (NP (BASENP (PRPD his) (NNS fingertips)) (COMMA ,) (SBAR (WHNP (WDT which)) (S (S (VP (VBD contracted) (BASENP (NN gangrene)))) (SBAR (IN after) (S (BASENP (PRP they)) (VP (VBD had) (VP (VBN frozen)))))))))))))) (CONJP (COMMA ,) (CC but)) (S (BASENP (PRP they)) (VP (VBD were) (VP (VBN committed) (S (VP (TO to) (VP (VP (VB do) (NP (BASENP (NN everything)) (PP (IN within) (BASENP (PRPD their) (NN power))))) (S (VP (TO to) (VP (VP (VB stop) (BASENP (PRP it))) (PP (IN from) (S (VP (VBG spreading)))))))))))))) (PERIOD .))