A splice acceptor containing Asc1 (CTAGTTCCCTTTTTTTTCACAG-GTTGGCGCGCCACGGTGATC) was inserted in the Nhe site of the intron of Gt(ROSA)26Sor, and then, into the Asc1 site, a sequence containing Asc1-loxP-CAT-pA-loxP-tauLacZ-betaGlobinpA-FRT-Neo-FRT-Asc1 was inserted to generate this allele with a loxP-flanked STOP sequence just upstream of tauLacZ. (J:237335)