FlyBase curator comment: Through to FB2026_02, the FM0 balancer was stated to carry 'Bar[1] f[1] m[2] sc[8] v[Of] w[1] y[31d]' according to FBrf0189689 and FBrf0102820, and an additional two alleles, cv[1] and v[1], according to the Red Book (FBrf0066905). The Bloomington Drosophila Stock Center have confirmed that FMO does not carry cv[1] or v[1], and that these were errors in the Red Book. Therefore, the statement of alleles carried by FMO according to the Red Book has been deleted.