ram-5 encodes a novel transmembrane protein; during male tail development, ram-5 activity is required in ray structural cells for proper sensory ray morphogenesis; a RAM-5::GFP fusion protein is expressed in all of the ray structural cells of the male tail, as well as additional sensory support cells in both hermaphrodites and males, including those of the inner labial sensilla as well as the ADE, PDE, and phasmid socket cells.