Shifty, the word redundancy or redundant-structures is also used to describe elements that are just identical & repeated (regardless what purouse it serves), not necessarely in the context you're expecting it (that they are there incase one is failing).
When Vince says that over 50% of CELL is devoted to redundant structures, he means exactly that.
When Vince says that over 50% of CELL is devoted to redundant structures, he means exactly that.