Despite the comparable expression levels of lysosomal proteins and the number of lysosomes (142.5 ± 11.78 vs. 129.8 ± 10.97, p = 0.43 with Student’s t-test), the lysosome size was increased in DM1 cells (Figure 4C), as shown by the average % area significantly occupied by LAMP1+ structures (Figure 4D). Here, LAMP1 is linked to myotonic dystrophy type 1.