4498
Down - regulation of Id1 mRNA correlated with mitogenesis and occurred when quiescent cells were treated with growth factors that activate G protein - coupled receptors and receptor protein tyrosine kinases but not with a non - mitogenic cAMP analog .
 GENE: Id1 mRNA; GENE: G protein - coupled receptors; GENE: receptor protein tyrosine kinases
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: Id1 mRNA; GENE: G protein - coupled receptors; GENE: receptor protein tyrosine kinases