Dear Editor,
The nucleosome assembly protein 1 (NAP-1),being a histone chaperone [1],primarily participates in the processes of nucleosome assembly and disassembly,histone transport,and histone eviction.Other functions were also endowed with this highly conserved protein.In budding yeast,NAP-1 specifically interacts with mitotic cyclins [2-3],and the absence of NAP-1 causes prolonged mitotic delays[2].