Recombinant Protein: S. aureus Clumping Factor A (rClfA) 40A (41-559) His6 Expressed and harvested from E. coli as a recombinant protein rClfA 40A (41-559) construct starts at the 41 amino acid sequence with a total of 559 amino acids The theoretical molecular weight of the protein is approximately 56.1 kDa rCflA protein (S. aureus) is intended for research use only, not for human, therapeutic, or diagnostic applications.