CCL1/I-309/TCA-3: Proteins and Enzymes

I-309, a member of the CC subfamily of chemokines, was initially identified by subtractive hybridization as a transcript that was present in a gamma/delta T cell line, but not in EBV-transformed B cells. Human I-309 is assumed to be a homolog of the mouse TCA-3. While the two proteins share only approximately 42% amino acid sequence identity, both chemokines contain an extra pair of cysteine residues not found in most other chemokines.