.M- .M Risk of Benzene-induced Leukemia Predicted from the Pliofilm Cohort Kenny S.

i ii INTRODUCTION Chronic exposure of humans to benzene causes bone marrow depression leading to pancytopenia and aplastic anemia (Goldstein, B.D., 1983).

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Friday, March 19, 1982 f Proposed 12119 Ftafar, FA, National Ooeepatieoal Huudt BurvsyPfiot Study ftl|MfaMt fan OcmMtknaS IMimm flAcwfBttM M and Heshh.

Misclassification of subjects can lead to over- or under estimates of risk, depending on whether cases are impacted differently than controls (1,2).

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To: AH Safety and Health Manual Holders A Interoffice Communication From: Date- Subject: 1" December 8, 1987 SCAFFOLD SAFETY RULES AND PROCEDURES, VSP 004 RESPIRATORY PROTECTION, VSP 005 Attached are the referenced procedures for your Safety and Health Manua1.

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The sections were stained with uranyl acetate and lead.

Thin sections were cut with a diamond knife and stained with uranyl acetate and lead citrate before ex amination on a Philips 300 electron microscope.