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eukaryote
They were (and still can be) shot with X-rays. This heightens mutation rate is Neurospora spores.
Randall Bruce Widelitz has written:
'Manipulation of cyclic nucleotide levels in Neurospora crassa' -- subject(s): Nucleotides, Neurospora crassa
This is a type of fungi whose spores have striations that look like neurons (nerve cells).
Drosophilla, Neurospora and pea plant has been frequently used as materials for genetic studies.