when tritiated thymidine triphosphate ( [ ( 3 ) h ] ttp ) or its immunohistochemically detectable analogue , bromodeoxyuridine triphosphate ( brdutp ) , is injected into blastomeres of leech embryos it passes throughout the entire embryo and is rapidly incorporated ( within 2 min after injection ) into nuclei of cells synthesizing dna ( s phase ) .
C0007610
nuclei of cells
C0080129
s phase