Many of these toxins, such as botulinum neurotoxin and ricin, act at low concentrations and require highly sensitive assays for detection. (pnnl.gov)
Highly sensitive assays and innovative strategies are finally changing that, and bringing a new era of liquid biopsies closer than ever. (sciencemag.org)
Newer work suggests that these circulating tumor cells may show up much earlier, but finding them then requires extremely sensitive assays. (sciencemag.org)