sentences:  This process occurs one minicircle at a time, and only a small number of minicircles are unlinked at any given moment.To keep track of which minicircles have been replicated, upon rejoining to the kDNA network a small gap remains in the nascent minicircles, which identifies them as having already been replicated.Minicircles that have not yet been replicated are still covalently closed.