Strains of the mutagen sensitive mutants uvs-4 and uvs-5 that originate from ascospores may initially grow at wild type rate. However, growth becomes slower and progressively more abnormal following vegetative growth (Schroeder 1970 Mol. Gen. Genet. 107:291-304; Newmeyer 1984 Curr. Genet. 9:65-74 and personal communication).
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Perkins, D. D.
"Use of a helper strain in Neurospora crassa to maintain stocks of uvs-4 and uvs-5, which deteriorate unless sheltered in heterokaryons,"
Fungal Genetics Reports:
Vol. 40, Article 26.