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Immunohistochemical staining of human lung AC for eicosanoid pathway enzymes using a tissue microarray. Four enzymes [inducible prostaglandin E synthase (PGES), cyclooxygenase-2 (COX-2), cytosolic phospholipase A2 (cPLA2), and prostacyclin synthase (PGIS)] were stained and scored for intensity. Example of the relative staining intensity scoring system is show at the right.
