We report on the construction and use of two eukaryotic expression vec
tors which add well-characterized epitope tags to the N termini of pro
teins. The utility of these Vectors is demonstrated for detecting the
expression of a variety of proteins. As the addition of these epitope
tags can in some cases obviate the need to generate specific antisera
to each individual protein, these vectors provide a facile means both
to monitor protein expression and to purify such expressed proteins.