ab269801 is a carrier free version of ab199017. This format is designed for use in antibody labeling, including fluorochromes, metal isotypes, oligonucleotides, enzymes. Please note that this antibody is an oligoclonal antibody. It is a cocktail of monoclonal antibodies that have been carefully selected. Oligoclonal antibodies have not only the specificity and batch-to-batch consistency of a monoclonal antibody, but also have the advantage of the sensitivity of a polyclonal antibody due to their ability to recognize multiple epitopes on an antigen.