GLP-1 protein and glp-1 mRNA is present in distal germline cells of adult hermaphrodites and males. glp-1 mRNA, but not GLP-1 protein, occurs in oocytes.
glp-1 transcript is abundant in early embryos but barely detectable in middle and late embryos. glp-1 transcript is abundant in embryos, present in a low but increasing level during larva development, and abundant again in adults.