Overextension of ALM axons at 25 °C was similarly suppressed by expression of either LRRK2-G2019S or LRRK2-R1441C, as observed in animals expressing wild-type LRRK2; the effect of PD-associated mutations was not evident in this axon phenotype (Supplementary Fig. S1). Here, LRRK2 is linked to Parkinson disease.