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Functional cis-acting regulatory elements in the bovine immunodeficiency virus (BIV) long terminal repeat (LTR) were identified by deletion mapping and nuclear protein gel shift analysis using three BIV-infectible cell lines, Cf2Th, BLAC-20, and EREp. Deletion mapping studies indicated that putative NF-κB, GRE, AP-4, AP-1, CAAT, and ATF/CRE transcription factor elements positively contribute to LTR-directed...