Panel (a) shows repression, (b) shows induction by IPTG, and (c) and (d) show the effect of a mutation to the lacI gene or to the operator, respectively.
No panel, (a) mostra a represión, (b) mostra a indución por IPTG, e (c) e (d) mostran o efecto dunha mutación no xene lacI ou no operador, respectivamente.