1666
Southern blot analysis of endonuclease - digested genomic DNA from primary chick embryo fibroblasts ( CEF ) suggested that MEK2 is a single - copy gene in this vertebrate species .
 GENE: MEK2
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: MEK2