The interaction of C9orf72 products and TDP-43 in frontotemporal dementia is one recent candidate (Vatsavayai et al., 2016) but the application need not be restricted to diseases with two protein pathogens; the role of the second morphogen in the Turing model might be taken by a non-pathogenic tissue factor. The gene discussed is TARDBP; the disease is frontotemporal dementia.