In mammalian cells , 2 broad groups of centromere-interacting proteins have been described: constitutively binding centromere proteins and 'passenger ,' or transiently interacting , proteins (reviewed by Choo , 1997) . The constitutive proteins include CENPA (centromere protein A; MIM 117139) , CENPB (MIM 117140) , CENPC1 (MIM 117141) , and CENPD (MIM 117142) . The term 'passenger proteins' encompasses a broad collection of proteins that localize to the centromere during specific stages of the cell cycle (Earnshaw and Mackay , 1994 [PubMed 8088460]) . These include CENPE (MIM 117143) ; MCAK (MIM 604538) ; KID (MIM 603213) ; cytoplasmic dynein (e.g. , MIM 600112) ; CliPs (e.g. , MIM 179838) ; and CENPF/mitosin (MIM 600236) . The inner centromere proteins (INCENPs) (Earnshaw and Cooke , 1991 [PubMed 1860899]) , the initial members of the passenger protein group , display a broad localization alo
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