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In contrast to the p16 - mediated G1 block , G1 arrest mediated by the cdk inhibitors p21Cip1 or p27Kip1 cannot be bypassed either by inactivation of pRb or overexpression of E2F family members .
 GENE: p16; GENE: cdk; GENE: p21Cip1; GENE: p27Kip1; GENE: pRb; GENE: E2F family members
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: p16; GENE: cdk; GENE: p21Cip1; GENE: p27Kip1; GENE: pRb; GENE: E2F family members