235611- Obsolete. No replacement recommendation. The HybriZAP-2.1 two-hybrid vector system, a eukaryotic system to detect protein–protein interactions in vivo, provides a method for the rapid identification of genes encoding proteins that interact with a given protein (i.e., a bait protein). Comes with predigested vector, Gigapack III Gold Packaging Extract, and XL1-Blue subcloning-grade competent cells.