GSK3B and depressive symptom measurement: Collapsin response mediator protein 2 (CRMP2) is a phosphorylation target of GSK3β (Wilson et al., 2014; Zhang and Koch, 2017) that has been implicated in schizophrenia (Zhang et al., 2016), AD (Yang et al., 2017) and depression (Xiang et al., 2020).