4065
As an approach to the determination of structure - function relationships in the PRP4 protein , we have isolated more than fifty new alleles of the PRP4 gene through random and site - directed mutagenesis , and have analyzed the phenotypes of many of them .
 GENE: PRP4 protein; GENE: PRP4 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: PRP4 protein; GENE: PRP4 gene