What do you think is the single best criterion for telling an endosymbiont of a eukaryotic cell from an organelle?
Post Script
I must come clean and confess that I formulated this question after having read a most stimulating review by John McCutcheon and Nancy Moran that touches on this subject. Some of the responses you provided are related to considerations in this article. Read and enjoy!
—Elio
If you already know that the organism inside the cell is an endosymbiont, you can perform an in situ stain against the conserved segments of the bacterial ribosome and only the bacteria will show up
Posted by: Rama Krishna Simhadri | May 14, 2013 at 01:20 PM