However, we found that a fraction of ectopically expressed mutant KRAS or NRAS fused to mNeonGreen colocalized with endolysosomes stained with Lysotracker Red in RPMI 8226 and SKMM1 cells (Fig. S5c), demonstrating that RAS colocalized with endolysosomes in MM cells. Here, KRAS is linked to Miyoshi myopathy.