Are PromoCell skeletal muscle cells (SkMC, C‑12530) differentiated or undifferentiated?

PromoCell skeletal muscle cells (SkMC, C‑12530) are supplied as undifferentiated myoblasts that proliferate under standard culture conditions.
These cells have retained theirl differentiation capacity. Upon withdrawal of serum and growth factors, differentiation is induced and the cells fuse to form multinucleated syncytia (myotubes).