Detection of IL-6 mRNA by RT-PCR in serial dilutions of RNA from the ear skin of the same WBB6F₁-+/+ (A), WBB6F₁-Kit^W/Kit^W-v (B), and +/+ MC→Kit^W/Kit^W-v (C) mice that are shown in Fig 1. Note that +/+ MC → Kit^W/Kit^W-v mice (C) were injected with SCF in both the L (mast cell-reconstituted) and R (mast cell-deficient) ears.