1352
Exposure of peripheral blood T cells from young subjects to PHA or cross - linked anti - CD3 monoclonal antibodies stimulated rapid increases in MAPK and MEK enzymatic activity .
 GENE: PHA; GENE: anti - CD3 monoclonal antibodies; GENE: MAPK; GENE: MEK
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: PHA; GENE: anti - CD3 monoclonal antibodies; GENE: MAPK; GENE: MEK