20663
We now present the crystal structure of ZAP - 70 in which Tyr 315 and Tyr 319 are not mutated , leading to the recognition of a five - residue sequence register error in the SH2 - kinase linker of the original crystallographic model .
 Chemical: Tyr; Chemical: Tyr
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: Tyr; Chemical: Tyr