From Johnson (2011b): DNA and RNA labeling of Mesodinium rubrum to reveal the cryptophycean and ciliate nuclei. A. A dividing cell with each daughter cell containing two macronuclei (Mac), the micronucleus undergoing karyokinesis, and only one daughter cell possessing a karyokleptic nucleus (KN) acquired from its cryptophyte prey, Geminigera cryophila. The cell is stained with the general nucleic acid stain DAPI; B. Two M. rubrum cells dual labeled with in situ hybridization probes for the M. rubrum (pink; cy- 5) and G. cryophila (green; FITC) SSU rRNA genes.