Salamanders can regrow entire limbs and regenerate parts of major organs, an ability that relies on their immune systems, research now shows. ... They then wiped out some or all of the macrophage cells to determine whether these cells were essential for regrowing the limbs.
A meaningful quote and/or a universal idea could serve as hooks for the introuction of a literary analysis.
An analgy or metaphor is typically used in a compare contrast essay, a definition of terms is more for a research paper as is a startling fact.
That would have to be an ellipsis. When you say something like, "There was only one catch, and that was Catch-22, which specified that a concern for one's own safety in the face of dangers that were real and immediate was the process of a rational mind. Orr was crazy and could be grounded (blah blah)"(Joseph Heller 46).
OR
,"There was only one catch, and that was Catch-22,...Orr was crazy and could be grounded (blah blah)"(Joseph Heller 46).
