Effect of receptor deletions on LTD4-induced ERK phosphorylation and c-Kit transactivation. (A) Dose-dependent LTD4-induced c-Kit and ERK phosphorylation in mBMMCs from the indicated genotypes. Results are from a single experiment repeated 4 times with cells from different animals. Vertical lines have been inserted to indicate repositioned gel lanes. (B) Quantitative densitometry of phospho-ERK signals corrected for the baseline for each genotype from 5 experiments.