1425
Platelet - derived growth factor - dependent activation of phosphatidylinositol 3 - kinase is regulated by receptor binding of SH2 - domain - containing proteins which influence Ras activity .
 GENE: Platelet - derived growth factor; GENE: phosphatidylinositol 3 - kinase; GENE: SH2 - domain - containing proteins; GENE: Ras
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: Platelet - derived growth factor; GENE: phosphatidylinositol 3 - kinase; GENE: SH2 - domain - containing proteins; GENE: Ras