Figure 2: HPTLC of the gangliosides of basal keratinocytes taken from skin explants from three donors 28, 58 and 70 years old. The gangliosides taken out of the keratinocytes incubated 48 h with 0.5 % potato hydrolysate were spotted against the control ones. Standard (Std): mixed gangliosides GM3, GD3 from human melanoma tumors.