Enzo Life Science of Farmingdale, NY, has received US Patent No. 7,537,751, "Labeling reagents and labeled targets comprising nonmetallic porphyrins." The patent claims labeling reagents, labeled targets, and processes for preparing labeling reagents. The described labeling reagents can take the form of cyanine dyes, xanthene dyes, porphyrin dyes, coumarin dyes, or composite dyes, the patent states. The labeling reagents are useful for labeling probes or targets, including nucleic acids and proteins. They can also be applied to protein and nucleic acid probe-based assays.