title: The hyaline layer is a collagen-containing extracellular matrix in sea urchin embryos and reaggregating cells.
mesh_terms: D000818:Animals; D002448:Cell Adhesion; D003094:Collagen / Q000378:metabolism; D005110:Extracellular Space / Q000378:metabolism; D012430:Ruthenium Red; D012617:Sea Urchins / Q000166:cytology / Q000196:embryology* / Q000378:metabolism
chemical_list: D012430:Ruthenium Red; D003094:Collagen