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Studies requiring gene expression analysis by microarray methods require the extraction of high quality RNA. Fresh, frozen tissue is the optimal sample for these studies. A detailed protocol to assist the investigator in tissue collection, RNA extraction and RNA quality assessment.

NIEHS funds a substantial portfolio of research in the field of environmental health sciences conducted by investigators in many disciplines from various organizations.

Dust mites are tiny microscopic relatives of the spider and live on mattresses, bedding, upholstered furniture, carpets and curtains.

Many people think animal allergies are caused by the fur or feathers of their pet.

Ragweed and other weeds such as curly dock, lambs quarters, pigweed, plantain, sheep sorrel and sagebrush are some of the most prolific producers of pollen allergens

Innate immunity is the process by which white blood cells and other parts of the immune system sense and respond to potential infections by causing an inflammation.

Molds are microscopic organisms that play an important role in the breakdown of plant and animal matter.

A pesticide is any substance used to kill, repel, or control certain forms of plant or animal life that are considered to be pests.

Reproductive health refers to the diseases, disorders and conditions that affect the functioning of the male and female reproductive systems during all stages of life.

Radon is a colorless, odorless radioactive gas. It comes from the natural decay of uranium or thorium found in nearly all soils.