- Centromere protein B null mice are mitotically and meiotically normal but have lower body and testis weights. Hudson, D.F., Fowler, K.J., Earle, E., Saffery, R., Kalitsis, P., Trowell, H., Hill, J., Wreford, N.G., de Kretser, D.M., Cancilla, M.R., Howman, E., Hii, L., Cutts, S.M., Irvine, D.V., Choo, K.H. J. Cell Biol. (1998)