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toxicologic pathology histopathology epl pathology toxicology ntp anatomic pathology immunohistochemistry stereology veterinary pathology rats pathology data pathology working group b6c3f1 mice pathology peer review ocular pathology aquatic pathology dopaminergic neurons diagnoses national toxicology program histology systematic random sampling pathology review optical fractionator lesion incidence disector pathologic evaluation eye anatomy pathology evaluation histochemical staining misdiagnoses fish fish histopathology ihc glp preclinical biorepository non-clinical necropsy repoductive pathology avain pathology pwg scientific advisory panel medical device pathology noel noael diagnosis consistency study pathologist reviewing pathologist third party peer review acvp peer review statement society for neuroscience neurons population estimates of neurons hepatocellular carcinoma microrna profiling ginkgo biloba extract metabolites kidney renal tubular pigmentation sot 2015 society of toxicology senna paraquat mice diquat cardiomyopathy gavage carcinogenicity epididymis mouse epididymal histocytic sarcoma thymomas nasal lesion drug-induced vascular injury lesion severity enu f344 rats histpoathology immunohistochemical characterization brain tumors regulatory issues regulatory consultation pathology experts libby amphibole society of toxicologic pathology subchronic inhalation amosite asbestos stp 2014 lesion nonneoplastic experimental pathology laboratories nonneoplastic lesion atlas nnl standardized lesion diagnosis terminology inhand design-based stereology neuroscience