- Differential regulation of chemokine production by Fcgamma receptor engagement in human monocytes: association of CCL1 with a distinct form of M2 monocyte activation (M2b, Type 2). Sironi, M., Martinez, F.O., D'Ambrosio, D., Gattorno, M., Polentarutti, N., Locati, M., Gregorio, A., Iellem, A., Cassatella, M.A., Van Damme, J., Sozzani, S., Martini, A., Sinigaglia, F., Vecchi, A., Mantovani, A. J. Leukoc. Biol. (2006)