1317
Ureases were purified from the recombinant cells and shown to be identical to control enzyme when analyzed by gel filtration chromatography and sodium dodecyl sulfate - polyacrylamide gel electrophoresis ; however , in every case the activity levels correlated to nickel contents as analyzed by atomic absorption analysis .
 GENE: Ureases
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Ureases