Benzopyrene tetrol

Following this approach, Vo-Dinh et al. have recently developed an antibody-based NSOM probe for the detection of benzopyrene tetrol (BPT) within single living cells.(Vo-Dinh et al. 2000) BPT, a carcinogen in humans, is an aromatic hydrocarbon that fluoresces at 439 nm following excitation at 374 nm. In their experiments, an optical fiber was pulled to sub-micron diameters and coated with silver using conventional means. Silver was used in lieu of the more common aluminum coating to avoid toxic effects... 

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