12210
ErbB2 becomes phosphorylated at tyrosine 877 in a dose - and time - dependent manner following exposure to X - rays , and activates downstream signaling cascades including PI3K / Akt .
 Chemical: tyrosine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: tyrosine