CSTX - 2a is composed of 61 amino acid residues .
CSTX - 2a is has a mass of 6864 Da , while CSTX - 2b is made up of 60 amino acids having a size of 6708 Da .
CSTX - 2a is composed of 61 amino acid residues and has a mass of 6864 Da , while CSTX - 2b is made up of 60 amino acids having a size of 6708 Da .