Context: The signatures of the parties' representatives follow at the very end. When the text of a treaty is later reprinted, such as in a collection of treaties currently in effect, an editor will often append the dates on which the respective parties ratified the treaty and on which it came into effect for each party.

Question: Whose signatures appear at the very end of a treaty?
Answer: the parties' representatives

Question: Where might the text of a treaty be reprinted?
Answer: in a collection of treaties currently in effect

Question: Who, upon reprinting, will often append the dates on which the treaty was ratified and came into effect?
Answer: an editor

Question: Each party must have done what in order for the treaty to come into effect?
Answer: ratified the treaty

Question: Even if signed  and ratified on the same date, the treaty might have done what on different dates?
Answer: came into effect