Biological markers act as quantifiable molecular tools in scientific research. They help identify and validate a wide array of biological conditions and processes. Protein biomarker techniques have enabled significant innovation in molecular diagnostics, disease research, and therapy development. A noteworthy example of how utilizing cell signaling proteins as detection molecules are CD antigens as biomarkers, which have advanced immunophenotyping and the development of therapeutic antibodies. Improved protein biomarkers in constant demand to keep up with the improving methods and experimental designs. kbDNA presents a selection of recombinant biomarkers and their data to support targeted function and rapid detection via versatile synthesis and enhanced tags.