n. (context biology English) The early developmental stage of a centriole or basal body
A procentriole is a centriole or basal body in a stage of early development. That is, it is what is to become a set of triplets of microtubules destined to form spindles of fibres that will separate chromosomes during mitosis and in order to act as anchoring sites for some proteins. A procentriole generally forms from the centrosphere in relation to deuterosomes (spherical fibrous granules also known as procentriole organizers) and assures that the centrosome becomes two during mitosis in eukaryotes. Only one procentriole forms next to each centriole during a cell cycle.