4009
Previous work established that the TAL1 proteins are phosphorylated exclusively on serine and identified Ser122 as a substrate for the mitogen - activated protein kinase ERK - 1 .
 GENE: TAL1 proteins; GENE: mitogen - activated protein kinase; GENE: ERK - 1
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: TAL1 proteins; GENE: mitogen - activated protein kinase; GENE: ERK - 1