Table 2B. Individual changes introduced into the lacZα indicator gene of pSJ1 by Tgo-Pol Z1 (exo⁻).

Mutation type	Number	Frequency (%)
A→T/T→A	8	7.4
A→C/T→G	0	0
A→G/T→C	2	1.9
G→A/C→T	37	34.3
G→C/C→G	37	34.3
G→T/C→A	12	11.1
Insertions	5	4.6
Deletions	7	6.5
Total	108	100
A→N/T→N	10	10.4
G→N/C→N	86	89.6
Transitions	39	40.6
Transversions	57	59.4

A total of 108 white colonies were completely sequenced in order to reveal the actual change in the DNA responsible for the white phenotype.