TABLE 3.

Effect of HU on Laac deletion rates

Expt no.	Without HU			With HU
	No. of blue colonies	No. of white colonies	% Deletiona	No. of blue colonies	No. of white colonies	% Deletiona
1	10	168	5.6	22	146	13.1
2	7	178	3.8	14	81	14.7
3	16	348	4.4	12	73	14.3
4	8	175	4.4	17	89	16.0
5	12	181	6.2	20	112	15.2
6	5	164	3.0	8	68	10.5
7	11	202	5.2	39	206	15.9
8	10	205	4.7	27	226	10.7
9	8	182	4.2	16	123	11.5
10	13	227	5.4	19	145	11.6
11	18	281	6.0	14	86	14.0
12	14	207	6.3	10	75	11.8
13	19	284	6.3	19	107	15.1
14	11	274	3.9	19	130	12.8
15	17	304	5.3	30	158	16.0
Avg			5.0			13.5
SD			1.0			2.0

^a% Deletion was determined by dividing the number of blue colonies by the total number of colonies and multiplying by 100.