Strain specific FLT3LG expression analysis in homozygous B-hFLT3LG mice by ELISA. Serum were isolated from wild-type C57BL/6 mice(+/+) and homozygous B-hFLT3LG mice(H/H). Mouse FLT3LG was detectable in wild-type mice (A). Human FLT3LG was exclusively detectable in homozygous B-hFLT3LG mice (B).