Indeed, in classical transwell chemotaxis assays towards IL-8-producing monolayers of HT-29 human colon carcinoma cells, both PKH26-labelled DC and PKH2-labelled PMNs are actively co-attracted to the lower chamber containing a confluent monolayer of HT29 cells (figure 1A and B). The gene discussed is CXCL8; the disease is colon carcinoma.