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Light micrographs of paraffin sections revealing the presence of trout CA in pseudobranch tissue
(a) Note the high immunoreactivity in the anti-vascular zone (◂). The capillary endothelium (★) and pillar cells (*) are not immunostained. (b) Higher magnification image shows that the pseudobranch cells displaying CA immunoreactivity are in the apical region (◂). The basal region with capillary endothelium (★) and pillar cells (*) are not immunostained
