Both soluble and coated forms of Lptn inhibit IL-2 secretion.

CD4⁺ T cells were activated with the indicated stimuli, as described in “Materials and methods.” Supernatants (day 1 after activation) were analyzed by ELISA for IL-2 secretion, as indicated in footnote of Table 1. The mean concentration values (pg/mL) with SD between parentheses are derived from 5 independent experiments.