Fig. 4.

Dependence of maximum germination rate on germinant concentration for the wild type and two mutants. l-alanine (a), l-valine (b), cycloleucine (c), β-aminobutyrate (d), α-aminobutyrate (e), and γ-aminobutyrate (f) were used as germinants for the wild type (●), gerAA110 mutant (▾), and gerAA111 mutant (▵). In each graph, the amino acid concentration (in millimolar) is shown on the x axis, and the maximum germination rate (percent optical density per minute) is shown on the y axis. Only the gerAA110 mutant gave a significant rate in panel f.