FCRL5 and Miyoshi myopathy: Moreover, FcRH5 expression is significantly higher in MM PCs than in normal PCs, and the expression levels of the FcRH5 protein have been reported to be significantly elevated in the patients with 1q21 alterations, being the FcRH5 gene located on the human chromosome 1 band 1q23.1 [28,29,30].