Notably, SupT-1 exhibited negligible surface B7-H3 expression (4.2 ± 0.2%), contrasting starkly with the MM cell lines NCI-H929, L-363, and KMS-12-PE, which manifested surface B7-H3 expressions of 30.7 ± 0.9% (p < 0.0001), 76.0 ± 1.5% (p < 0.0001), and 98.3 ± 0.6% (p < 0.0001), respectively (Fig. 1A, B). The gene discussed is CD276; the disease is Miyoshi myopathy.