Vector Laboratories Inc. has added several DyLight fluorescent conjugates for immunofluorescent staining to its product range. Direct alternatives to traditional fluorophores, including fluorescein and rhodamine, the fluorescent dyes are conjugated to affinity-purified anti-mouse IgG (H+L), anti-rabbit IgG (H+L) and streptavidin. Current offerings include green DyLight 488, orange DyLight 549 and red DyLight 594. According to the company, all offer brighter fluorescence and greater photostability than other fluorochromes and can be easily substituted in existing protocols because of their parallel excitation and emission spectra. Stable over a pH range of 4 to 9, they are compatible with many aqueous-based buffers and diluents.