“…These include hyaline, proteoglycans, glycosaminoglycans, glycoproteins, laminin, and collagen (Spiegel and Spiegel, 1979;Adelson and Humphreys, 1988;Reimer and Crawford, 1990;Crawford and Crawford, 1992;Crawford et al, 1997). In echinoids studies on the secretion of the glycoprotein hyalin, as well as collagen, fibronectin, and laminin show that these molecules are not all released at fertilization but have distinct spatial and temporal expression patterns that extend for at least 30 h postfertilization (Alliegro et al, 1988;Matese et al, 1997).…”