Growth of mxaF (A) and mxaF xoxF1 xoxF2 (B) mutant strains in MP methanol medium containing 20 μM Ca (♢) and 20 μM Ca with 2 μM different lanthanides—La (□), Ce (△), Pr (×), Nd (+), Dy (●), Ho (×), Er (◆), and Yb (■)—with the exception of Sm, tested at 2 μM (○) and 20 μM (-). The graphs show representative data from three biological replicates. Variation in growth rates between biological triplicates was within 2%.