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...Acta scientific pharmaceutical sciences issn volume issue july review article plant histochemistry a versatile and indispensible tool in localization of gene expression enzymes cytokines secondary metabolites detection plants infection pollution farid badria walaa s aboelmaaty department pharmacognosy mansoura university faculty pharmacy egypt corresponding author received june published doi asps abstract are sources active used medicine primary for isolation natural products the medicinal properties due to presence including flavonoids alkaloids tannins saponins which great importance because they possess significant biological activities particular constituents many crude drugs still unknown histochemical studies confirm identification cellular tissue chemical components sec ondary methods employed density accumulation distribution chemi cal compounds within cells tissues different organs under microscopes using color stain reaction technique photographic recording these include prep...