CD79A and Miyoshi myopathy: The most prominent differences concerned the IGHV3-21 gene, which exhibited a frequency of 4.2% in IgG MM versus only 0.6% in IgA MM (p-value <0.05), and the IGHV5-51 gene, accounting for 4.7% in IgG MM versus 1.2% in IgA MM (p-value=0.05) (Supplemental Table 2) (Figure 1).