Table I.

Summary of the mutant screen

Isolate Name	Allele	Nature of Mutation
128	fhy3-128	Recessive
6476	fhy3-6476	Recessive
A2GO5	phyA-300D	Dominant
135	phyA-301	Recessive
158	hy5-158	Recessive
CS19960	fhy1-19960	Recessive
149	fhy1-149	Recessive
A2GO6	fhy4-1	Recessive