A recent study by Roczkowsky et al. (2023) found reduced peroxisomal transcripts and proteins (including PEX3, PMP70 and PEX14) and robust induction of cytokine transcripts (including Il-8 and Cxcl10) and protein levels (IL-18 and GM-CSF) in brain samples from COVID-19 patients compared to other disease controls. The gene discussed is ABCD3; the disease is COVID-19.