Fig. 2. Calcium responses to LTD₄ following ATP- and UDP-induced P2Y receptor activation. Representative traces of the [Ca²⁺]_i transient induced by 10 nM LTD₄ (2nd challenge) after an initial challenge with increasing concentrations of ATP (A) and UDP (B). (C) Values shown represent means of [Ca²⁺]_i stimulation over basal (s/b) ± s.e.m. of at least three independent experiments. Statistical comparison of multiple groups were analyzed using one way ANOVA followed by Dunnett post hoc test (^*P<0.05; ^**P<0.01, vs control).