5048
Of five positive clones isolated from 0.75 x 10(6) yeast colonies, four were members of the CREB/activating transcription factor (ATF) family : CREB , two isoforms of the cyclic AMP-responsive element modulator ( CREM ), and ATF-1 .
 ( protein: CREB, None) , ( protein: CREM, None) , ( protein: two isoforms of the cyclic AMP-responsive element modulator, None) , ( protein: CREB/activating transcription factor (ATF) family, None) , ( protein: ATF-1, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: CREB, None) , ( protein: CREM, None) , ( protein: two isoforms of the cyclic AMP-responsive element modulator, None) , ( protein: CREB/activating transcription factor (ATF) family, None) , ( protein: ATF-1, None) 