Notch1 (D6F11) XP® Rabbit mAb (PE Conjugate) recognizes intracellular epitopes between 2400 and 2500 amino acids of human Notch1 protein. It recognizes both the full-length (~300 KDa) and the NTM region (~120 KDa), which consists of a short extracellular juxtamembrane peptide, a transmembrane sequence, and the intracellular domain (NICD). The antibody cannot detect the extracellular (ligand-binding) domain of Notch1 following cleavage at the S2 site by ADAM-type metalloproteases.This Cell Signaling Technology antibody is conjugated to phycoerythrin (PE) and tested in-house for direct flow cytometry analysis in human cells. The antibody is expected to exhibit the same species cross-reactivity as the unconjugated Notch1 (D6F11) XP® Rabbit mAb #4380.