A
hst-3.1 reporter displayed limited expression during early embryogenesis, but was visible in the pharynx and body wall muscle by the embryonic threefold stage. During larval and adult stages, the reporter continued to be expressed in body wall muscle, vulval muscle and the pharynx. In addition, we detected expression in at least six neurons in the head, including the NSM, RIH, RIS, and an unidentified pair of neurons as well as some select epithelial cells. No obvious expression was seen in either AIY or HSN interneurons. Additional expression is observed in the coelomocytes (cc), the distal tip cell (dtc), and rectal cells (U,F/K, B AND Y/PDA). In adults, expression is predominantly seen in body wall muscles, vulva muscles, the muscle arms, the pharynx, and the rectal epithelium.