No creditable macrofossil record of the Fagaceae exists in the Cretaceous equivocal and require further study. 白垩纪尚无壳斗科可靠的大化石记录,微化石需要进一步研究才能确定亲缘关系以及古新世壳斗科已经分化出两个类群.
在植物细胞中像这种染色适度的物质在着丝点上是特别显著的.In plant cells, for example , this moderately stained material is particularly prominent at kinetochores.着丝点微管的末端牢牢地埋入纺锤极.The distal end of the kinetochore tubule is firmly embedded in the pol...