The vector consists of Fpr-rs3 promoter (400 bp), first exon (53 bp), the 5â² end (1163 bp) and the 3â² end (784 bp) of the original 24-Kb intron, the 3â² end of the original intron, and Fpr-rs3 CDS, IRES-tauVenus-IRES-Cre sequence, and 1977 bp of the Fpr-rs3 3â²UTR. This vector was injected in the pronuclei of C57BL6/J-DBA/2J F2 zygotes. Nine founders were obtained, five lines were characterized, and three lines were analyzed in this work, labeled as #2, #5, and #7.