7024
These strains , defective in dCTP deaminase and nucleoside diphosphate kinase , respectively , are characterized by both disturbances of dNTP pools and a mutator phenotype . ndk strains have been studied before , but were included in this study , as controversies exist regarding the source of its mutator phenotype .
 Chemical: dCTP; Chemical: nucleoside diphosphate; Chemical: dNTP
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: dCTP; Chemical: nucleoside diphosphate; Chemical: dNTP