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A second peptide ( amino acids 58 - 77 ) also antagonized p21 - activity , but this peptide did not affect the ability of p21 to interact with cyclin E / Cdk2 .
 GENE: p21; GENE: p21; GENE: cyclin E; GENE: Cdk2
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: p21, p21, cyclin E, Cdk2 
Answer:
 GENE: p21; GENE: p21; GENE: cyclin E; GENE: Cdk2