【Character】: From sensitized T lymphocytes derived from, a double helix or RNA nucleotide and peptide complexes. By 12 amino acids and 3 to 4 ribose nucleotide composition. Molecular 5000. Soluble, dialysis, ultrafiltration, freeze-drying. Liu and sulfur acid, trichloroacetic acid negative reaction, Biuret positive, ribose - 2 hydroxy toluene reagents positive. Right DNA enzyme, RNA enzyme and pancreatic trypsin resistant. Without heat, 56 °C for 30 minutes inactivation. Cryopreservation few years, the activity does not disappear.