PLXNB3 and COVID-19: PLXNB3, overexpressed in our Long-COVID outpatients has been previously linked to COVID-19 (Yaşar et al. 2021); it was shown to stimulate neurite outgrowth in mice and was also associated with verbal performance and brain white matter volume in humans (Hartwig et al. 2005; Rujescu et al. 2007).