Yellow fluorescent dye; supplied as an NHS ester for coupling to primary amine groups. Compatible with self-labeling tag systems, e.g.HaloTag? and SNAP-tag?. Suitable for confocal fluorescent imaging and super resolution microscopy (SRM) techniques, such as dSTORM (live and fixed cells). Can be multiplexed for two color imaging with Janelia Fluor? 635 SE (Cat. No. 6419). Cell permeable. Excitation maximum = 525 nm; emission maximum = 549 nm; quantum yield = 0.91; Extinction coefficient = 122,000 M-1cm-1; Correction factor A280 = 0.185. We also offer Janelia Fluor? conjugated antibodies and custom conjugation services with our sister company Novus Biologicals. HaloTag is a trademark of Promega Corporation, and SNAP-tag is a trademark of New England BioLabs, Inc.. MW (observed): 623.51.