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releaser gland A gland in turbellarians that secretes a chemical that dissolves the attachment of the organism from a substrate.
releaser Simple stimulus that elicits an innate behavior pattern.
stereoblastula - embryo produced by spiral cleavage, characterized by the absence of a blastocoel; formed by embryos of annelid worms, turbellarian flatworms, nemertean worms, and all molluscs except cephalopods.
 See also: Molecule, Nucleic acid, Long, Membrane, Vision
  
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