Attractin, a dipeptidyl peptidase IV/CD26-like enzyme, is expressed on human peripheral blood monocytes and potentially influences monocyte function.
Wrenger S, Faust J, Friedrich D, Hoffmann T, Hartig R, Lendeckel U, Kähne T, Thielitz A, Neubert K, Reinhold D. J Leukoc Biol. 2006 Sep; 80(3):621-9. Epub 2006 Jul 11.