title: WHO-IUIS International Standards: advantages of these extracts.
authors.affiliation: Johns Hopkins University, Asthma and Allergy Center, Baltimore, MD 21224.
authors.forename: P S
authors.initials: PS
authors.lastname: Norman
mesh_terms: D000485:Allergens; D000818:Animals; D006801:Humans; D012015:Reference Standards; D014944:World Health Organization
chemical_list: D000485:Allergens