RAB38 is a member of the Ras-related protein family and serves as a key regulator of intracellular membrane trafficking, particularly within the endosomal-lysosomal system. Primarily located in the cytoplasm, RAB38 coordinates the movement and fusion of membrane-bound vesicles, ensuring correct sorting and delivery of cargo molecules. This protein plays a specialised role in melanosome biogenesis, supporting the maturation and transport of melanosomes — organelles responsible for melanin synthesis and distribution in melanocytes. Through its interactions with effector proteins and membrane fusion machinery, RAB38 facilitates these vital cellular processes.