Table 3.

GAS M49 and its isogenic ralp3 mutant were analyzed for their ability to utilize different carbon sources^a

Substrate	GAS M49 (mean OD ± SD)
	Wild type	Δralp3 mutant	P
α-d-Lactose	0.29 ± 0.06	0.77 ± 0.18	0.032
d-Trehalose	0.47 ± 0.03	0.73 ± 0.05	0.001
Maltose	0.87 ± 0.05	0.71 ± 0.05	0.041
Maltotriose	0.77 ± 0.06	1.16 ± 0.09	0.005
3-O-β-d-Galactopyranosyl-d-arabinose	0.27 ± 0.02	0.04 ± 0.06	0.005

^aOnly significant differences between wild-type and mutant strains are listed. The optical densities (ODs) of the wild-type culture grown on α-d-glucose were set to 1, and the ODs of growth of wild-type and Δralp3 mutant strains on other carbon sources are related to this value.