The earliest detectable expression of UNC-115::GFP was in neurons and epidermis at about 300 min postfertilization, when the embryo begins to elongate, and axons begin to grow. UNC-115::GFP and the shorter fusion GFPS was expressed in most or all neurons throughout development. UNC-115::GFP expression was also observed in non neuronal cells, including the epidermal syncytium
hyp7, the head and tail epidermal cells, the excretory canal cell, the pharynx, and the developing vulva, but not in the lateral epidermal seam cells or the ventral epidermal P cells.