AD, ALS, and frontotemporal dementia-related proteins, such as tau and TDP-43 can form LLPS droplets (Molliex et al., 2015; Patel et al., 2015; Conicella et al., 2016; Ambadipudi et al., 2017; Harrison and Shorter, 2017; Boeynaems et al., 2018; Wegmann et al., 2018; Ambadipudi et al., 2019; Jiang et al., 2019). This evidence concerns the gene MAPT and Alzheimer disease.