GFP analysis of the transformed animals revealed that
rcn-1 is expressed from late embryonic stages to adulthood in diverse tissues, including lateral hypodermal cells, marginal cells of the pharynx, vulva epithelial cells, ventral and dorsal nerve cords and commissures, and various neurons in the anterior and posterior portions of the worm. Male C. elegans displayed
rcn-1 expression in male tail structures including the diagonal muscles, sensory rays, and spicules. GFP expression analysis of a shorter 1.6 kb 50 upstream fragment of
rcn-1 revealed vulva muscle expression in addition to the aforementioned expression patterns.