Anti-Caspase 3 antibodies detect the protein encoded by the gene CASP3 in humans, which is also known as Lice, Sca-1, CPP32, CPP32B, SCA-1, and CASP-3. The reported amino acid length is 277 and the expected mass is 31.6 kDa. Variants of this antigen may also be found in other species, including plants, canines, porcine, monkeys, mice, and rats. The Caspase 3 antigen is a documented mesenchymal and hematopoietic stem cell marker.