A complex ECM layer called the hyaline layer (HL) surrounds embryos and larvae of the starfish Pisaster ochraceus. When preserved by freeze substitution, the HL of a bipinnaria larva consists of six sublayers. From the plasmalemma outwards these are the intervillous layer (iv), the H3, H2, H1 sublayers that make up the supporting layer, a boundary layer (b… (More)
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