Chromosomal passengers are proteins that move from centromeres to the spind
le midzone during mitosis. Recent experiments show that the passengers inne
r centromere protein (INCENP) and aurora-B kinase are in a macromolecular c
omplex that might also contain a third passenger, survivin. The chromosomal
passenger complex functions throughout mitosis in chromosome condensation
and segregation, and at the end of mitosis, in the completion of cytokinesi
s.