the organization of the ribosomal dna ( rdna ) repeat unit in the standard wild-type strain of neurospora crassa , 74-or23-1a , and in 30 other wild-type strains and wild-collected strains of n. crassa , . tetrasperma , n. sitophila , n. intermedia , and n. discreta isolated from nature , was investigated by restriction enzyme digestion of genomic dna , and probing of the southern-blotted dna fragments with specific cloned pieces of the rdna unit from 74-or23-1a .
C0012854
dna
C0012933
rdna