tokens: The proximal promoter contains a region termed CLEO ( -54 to -31 ) that consists of a purine-rich element abutting an activator protein-1 ( AP-1 ) -like site , as well as an upstream nuclear factor-kappa B ( NF-kappa B ) site ( -85 to -76 ) and a CK-1 element ( -101 to -92 ) .