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031366 b6.129p2(cg)il4il13j targeting vector was designed to insert a loxpflanked blasticidin (bsd) resistance cassette upstream of exon 3 of the interleukin 13 (il13) gene, and a frtflanked neomycin resistance cassette followed by a single loxp site downstream of exon 4 of the interleukin 4 (il4) construct was electroporated into 129p2olahsdderived e14 embryonic
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