Animals display reduced body bends and thrash rates, slow growth, and fragmented mitochondria. cjn20 is a 2629 bp deletion removing nucleotides 25-2654 of the fzo-1 locus. Originally published as cjn020. Reference: Byrne JJ, et al. Cell Mol Life Sci. 2019 May;76(10):1967-1985. (PMID 30840087)