2021
The other end of this cluster contained the human type I cytokeratin K20 and K12 gene loci .
 GENE: human type I cytokeratin; GENE: K20; GENE: K12 gene
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 type I cytokeratin; GENE: K20; GENE: K12 gene