hIL4I1 inhibits T-cell proliferation. CD3-stimulated T lymphocytes were incubated alone (■), with irradiated mock-HEK (▩), or with irradiated hIL4I1-HEK (□). Proliferation was measured by ³H-thymidine incorporation during the last 8 hours of a 4-day culture. Results are expressed as the average cpm of quadruplicates ± standard deviation (SD). A representative experiment (of 3) is shown. *P < .05. CD3-stimulated T lymphocytes were incubated with mock beads (▴) or hIL4I1 beads (■) either in direct contact (B) or through a 0.4-μm transwell (C). Proliferation was measured by ³H-thymidine incorporation during the last 8 hours of a 4-day culture. Results are expressed as the average cpm of quadruplicates ± standard deviation (SD). A representative experiment (of 4) is shown. *P < .05.