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A second important molecule in TCR signal transduction is the guanine nucleotide binding protein , p21ras , which is coupled to the TCR by a protein tyrosine kinase dependent mechanism .
 GENE: TCR; GENE: guanine nucleotide binding protein; GENE: p21ras; GENE: TCR; GENE: protein tyrosine kinase
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: TCR; GENE: guanine nucleotide binding protein; GENE: p21ras; GENE: TCR; GENE: protein tyrosine kinase