This application discloses a BBB-selective antibody. The BBB-selective antibody comprises a protein encoded by a DNA sequence comprising SEQ ID NO:7 (CDRH1 of scFv 15), SEQ ID NO:8 (CDRH2 of scFv 15), SEQ ID NO:9 (CDRH3 of scFv 15), SEQ ID NO:10 (CDRL1 of scFv 15), SEQ ID NO:11 (CDRL2 of scFv 15) and SEQ ID NO:12 (CDRL3 of scFv 15) or a DNA sequence comprising SEQ ID NO:19 (CDRH1 of scFv 38), SEQ ID NO:20 (CDRH2 of scFv 38), SEQ ID NO:21 (CDRH3 of scFv 38), SEQ ID NO:22 (CDRL1 of scFv 38), SEQ ID NO:23 (CDRL2 of scFv 38) and SEQ ID NO:24 (CDRL3 of scFv 38). Preferably, the BBB-selective antibody comprises a protein encoded by SEQ ID NO:1 or 3.