Table 1.

Survival of pigment cells in clonal cultures

	Control	+ ET3
Number of plated cells	265	270
Number of d1 clones	183	208
Percent of plated cells	69%	77% (ns)
Number of d13 clones	142	166
Percent of plated cells	53.6%	61.5% (ns)
Percent of d1 clones	77.6%	80% (ns)

The number of clone-forming cells in control and ET3-treated cultures was determined at d1 and d13 in four experiments. Results are expressed as percent of total plated cells. Clone survival is given by the number of clones at d13 expressed as percent of d1 clones. ns, not significant.