4107
The human p18 gene spans at least 7 . 5 kb and is composed of three exons , two of which encode the p18 protein .
 GENE: human p18 gene; GENE: p18 protein
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: human p18 gene; GENE: p18 protein