A histochemical study of the epidermal mucous cells of brown trout revealed that they contained both neutral and acidic mucosubstances which were diastase‐resistant, PAS‐reactive. Neuraminidase treatment, methylation and combined staining procedures suggested that the acidic nature of the mucins was due mainly to the presence of sialic‐acid containing glycoprotein. These results augment data derived from biochemical analyses of the epidermal mucus of salmonid fish.
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Harris et al. (1973) studied this question.
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