Thin sections and replicas of freeze-etched pituitaries from six species of the teleostean family of Cichlidae were studied by electron microscopy. Four species belonging to the genusTilapiaexhibit rod-like structures, i.e., “bacilliform inclusions” (BI), about 1–2 μm in length in cells of the proximalPars distalis.The BI are found either isolated or fused in small groups. They are enclosed in an envelope similar to that of secretory granules. Both the BI and the secretory granules give a positive PAS-re
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