Antibodies are needed for western blot, immunoprecipitation, and protein purification among other methods. It is difficult to purify a protein made recombinant (cloning the cDNA, expressing the protein, purifying the protein. There are many custom peptide synthesis services which bypass all this! You can simply order a specific peptide of your protein, and then use this peptide to generate an antibody. There are many antibody vendors are service providers that will make antibodies using peptides that they will synthesize for you. |