5518
Analyses of additional tumors induced in mice from two reciprocal crosses , A / J x C3H / HeJ F1 ( hereafter called AC3F1 ) and C3H / HeJ x A / J F1 ( hereafter called C3AF1 ) , provided evidence for the inactivation of one allele of the putative chromosome 4 tumor suppressor gene by parental imprinting .
 None
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:  
Answer:
 None