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histopathology macroscopic pathology veterinary pathology necropsy clinical pathology reversible cell injury granulomatous lesion postmortem systemic patholgy general pathology vetrinary pathology peafowl peacock lesions putrefaction rossete like structure bacterial decomposition club like structure wooden tongue gross examinantion micrscopic examination lumpy jaw disease histology gomoris trichome bule gomoris trichome green mt stain oil red o sudan 3 gross examination grosslesion pathology introduction practical demonstration courses meat inspection postmortem lesions tissue sample fixation dehydration clearing ethanol xylene paraffin microscopic study death autopsy pallor mortis rigor mortis algor mortis livor mortis hypertrophy hyperplasia hypoplasia cardiac hyper trophy metaplasia dysplasia cell inhury irreversible cell inury cellular adaptations cell injury irreversible cell injury fatty change cloudy swelling hydropic degenration vacuolar degeneration apoptosis necrosis coagulative necrosis liquefactive cassious gangrenous dry gangrene wet gangrene giant cell sudan black sudan 4 safranin grocott silver nitrate masson trichome stain chondrocytes mast cell cirhosis fibers elastic fibers gram staining wright stain leishman stain embedding microtome pathology introduction four aspects of disease 濒别蝉颈贸苍 gross lesion microscopic lesion morphological change aeteiology atrophy