tokens: Inorganic lead ( Pb ) is a ubiquitous environmental contaminant that produces a variety of effects on humoral and cell mediated immune responses .
folded_tokens: inorganic lead ( pb ) is a ubiquitous environmental contaminant that produces a variety of effects on humoral and cell mediated immune responses .
labels: O B-atom O B-atom O O O O O O O O O O O O O O O O O O O O