We chose to employ NIH-CXCL14 conditioned medium as a source of exogenous CXCL14 to study the effects on the proliferation of two human glioblastoma cell lines, LN229 and U87MG, both expressing CXCL14, though at low levels (Figure 1), but unable to produce detectable levels of the secreted chemokine in their supernatants (not shown). The gene discussed is CXCL14; the disease is glioblastoma.