The MMTV-lpa3 transgenic construct contains the 1.54 kb MMTV LTR and the full-length cDNA of FLAG-tagged human LPA3 receptor linked to the KCR fragment containing the exon II (E2), intron II (I2), exon III (E3), and polyadenylation signal (rbGpA) derived from rabbit beta-globin. Two MMTV-lpa3 (#LPA3-3 and #LPA3-22) founders passed the transgene through the germ line.