Tamra is a Carboxytetramethylrhodamine, a derivative of rhodamine. Tamra (Figure 1) represents an excellent alternative to NED as FRET acceptor for FAM fluorophore, in real-time PCR or automated DNA sequencing applications.
Figure 1. Structure of 5'-Tamra (R = sequence).
metabion offers the Tamra modification in its DNA and RNA portfolio: