The methionine-10 mutant allele of N. crassa codes for a protein of unknown function, Swiss:O27901. However, homologous proteins have been found in yeast (Swiss:P38793) suggesting this protein may be involved in methionine biosynthesis, transport and/or utilisation [1].

1: Sequence of the met-10+ locus of Neurospora crassa: homology to a sequence of unknown function in Saccharomyces cerevisiae chromosome 8. Chow CM, Kang S, Metzenberg RL, RajBhandary UL; Gene 1995;162:111-115. PMID:7557397