Any monoclonal antibody or group of monoclonal antibodies that does not react with known surface molecules of lymphocytes, but rather to a yet-unrecognized surface molecule would be clubbed as a new cluster of differentiation and numbered accordingly.
Calquera anticorpo monoclonal ou grupo de anticorpos monoclonais que non reaccionan con moléculas da superficie dos linfocitos coñecidas, senón cunha molécula da superfice aínda non recoñecida sería considerado un novo cluster de diferenciación e daríaselle un número.