M-M-RVAXPRO is very similar to another presentation of the measles, mumps and rubella vaccine already authorised (M-M-R II) but with a slight difference: where the existing presentation is manufactured with a protein, albumin, that is extracted from human serum (the liquid part of the blood); M-M-RVAXPRO is manufactured with the same protein, but made using ‘ recombinant DNA technology’ (a technique where a yeast is given a gene (DNA) that makes it able to produce human albumin).