1185
A second even more significant match to this E . coli region was found in the retroviral ribonuclease H ( RNase H ) domain , and corresponds precisely to a region that has been aligned by previous investigators with the E . coli RNase H , suggesting that Pol I helices O and P are homologous to helices A and D of the RNase H crystal structure , respectively .
 GENE: retroviral ribonuclease H; GENE: RNase H; GENE: E . coli RNase H; GENE: Pol I; GENE: RNase H
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: retroviral ribonuclease H, RNase H, E . coli RNase H, Pol I, RNase H 
Answer:
 GENE: retroviral ribonuclease H; GENE: RNase H; GENE: E . coli RNase H; GENE: Pol I; GENE: RNase H