948
High - affinity binding was also observed with recombinant SH2 domains from v - src and v - fps , raising the possibility of protein - protein interactions between various members of the cytoplasmic PTK family .
 GENE: recombinant SH2 domains; GENE: v - src; GENE: v - fps; GENE: cytoplasmic PTK family
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: recombinant SH2 domains; GENE: v - src; GENE: v - fps; GENE: cytoplasmic PTK family