Cautionary Reflections
P. 218

Environews

Forum

Last Supper for Mosquitoes
The Threat of Meth
A New Side of the Nicotinic Receptor
EDF Launches "3,000 by 2000" Project
Doing a World of Good
P. 222

Focus

Perplexing Peroxisome Proliferators
P. 232
Environmental Assault on Immunity
P. 236

What GATT Begot: Environment versus Trade
P. 240

The Amazing Shrinking Laboratory
P. 244

• A Polymorphism in the -Aminolevulinic Acid Dehydratase Gene May Modify the Pharmacokinetics and Toxicity of Lead
  C. Mark Smith, Xi Wang, Howard Hu, and Karl T. Kelsey
  P. 248

• Expression of Xenobiotic-Metabolizing Enzymes in Cultured Rat Tracheal Epithelial Cells
  Andre Castonguay, Lila Overby, Paul Nettesheim, George C. Clark, and Richard M. Philpot
  P. 254

• Tissue Repair Response as a Function of Dose in Thioacetamide Hepatotoxicity
  Raja S. Mangipudy, Sanjay Chanda, and Harihara M. Mehendale
  P. 260

• Mitotic Disturbances and Micronucleus Induction in Syrian Hamster Embryo Fibroblast Cells Caused by Asbestos Fibers
  Elke Dopp, Jutta Saedler, Helga Stopper, Dieter G. Weiss, and Dietmar Schiffmann
  P. 268

• Half-life of Polybrominated Biphenyl in Human Sera
  Daniel H. Rosen, W. Dana Flanders, Andrew Friede, Harold E. B. Humphrey, and Thomas H. Sinks
  P. 272

• Daily Estimates of Soil Ingestion in Children
  Edward J. Stanek III and Edward J. Calabrese
  P. 276

  Air Pollution and Unscheduled Hospital Outpatient and Emergency Room Visits
  Xiping Xu, Baoluo Li, and Huying Huang
  P. 286