BAG3 and myofibrillar myopathy: Notably, mutations in the BAG3 IPV motifs also contribute to human disease: a Pro‐to‐Leu mutation is implicated in myofibrillar myopathy (Selcen et al,2008; Freilich et al,2018; Meister‐Broekema et al,2018), and another Pro‐to‐Ser mutation is implicated in CMT disease (Shy et al,2018; Adriaenssens et al,2020).