Histological, Ultrastructural and Immunohistochemical Studies on the Skin of Catfish some histological and seasonal studies on the integument of the Catfish A histological study on the prenatal development of the parathyroid gland of Guinea pig with relation to bone formation Postnatal developmental studies on the parathyroid gland of male Guinea pig with relation to bone formation Electron Microscopy and Immunohistochemistry using Indicators of Apoptosis and Proliferation on Guinea Pig Parathyroid Gland Developmental studies on parathyroid gland of Guinea pig in relation to bone formation Immunohistochemistry of PPARα, PPARγ and IFNγ in kidney tissues of african catfish (clarias gariepinus) at different seasons