Bid rent theory in the central business district (CBD) [edit]. Land users, whether they be retail, office, or residential, all compete for the most accessible land within the CBD. The amount they are willing to pay is called bid rent.
Recombinant or purified protein vaccines consist of protein antigens that have either been produced in a heterologous expression system (e.g., bacteria or yeast) or purified from large amounts of the pathogenic organism.
The MMR vaccine (also known as the MPR-vaccine after the Latin names of the diseases) is an immunization vaccine against measles, mumps, and rubella (German measles). It is a mixture of live attenuated viruses of the three diseases, administered via injection.