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Different types of cells are widespread in this layer. Association of histochemical methods, progressive extractions and nitrogen estimations allowed detection and localization of 3 main components in the tunic: acidic mucopolysaccharides, neutral polysaccharides (cellulose) and proteins. Proteins (scleroproteins?) are especially concentrated in the cuticle while bundles of the fundamental substance are built up with cellulose fibres embedded by amorphous mucopolysaccharides. The tunic of <i>H. Papillosa</i> is compared with the tests of the 2 phlebobranch ascidians, <i>Ascidiella aspersa</i> and <i>Phallusia mammillata</i>.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Recherches sur la morphologie et étude histochimique de la tunique d'<i>Halocynthia papoillosa</i> Gun. 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