Telokin is an acidic protein with a PI value of 4-5 and 17-kDa with an amino acid sequence that is identical to the C terminus of the 130-kDa myosin light chain kinase (MLCK), although it is expressed as a separate protein and produced by an alternate promoter of the MLCK gene. Telokin is transcribed from a second promoter, located within an intron, in the 3' region of the MLCK gene. And that is why the concentration of telokin (at least 15 μM) is higher than MLCK concentration.