7713
A novel , testis - specific mRNA transcript encoding an NH2 - terminal truncated nitric - oxide synthase . mRNA diversity represents a major theme of neuronal nitric - oxide synthase ( nNOS ) gene expression in somatic cells / tissues .
 testis - specific mRNA transcript, NH2 - terminal truncated nitric - oxide synthase, neuronal nitric - oxide synthase, nNOS
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 testis - specific mRNA transcript, NH2 - terminal truncated nitric - oxide synthase, neuronal nitric - oxide synthase, nNOS