"I've been very fortunate, because sometimes it's difficult to work with your spouse. But in our case, it's a great working relationship, and we have complementary skills which makes it easy to work together. So I've been very fortunate in that regard."

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If the structure that serves as a template (the gene or virus molecule) consists of, say, two parts, which are themselves complementary In structure, then each of these parts can serve as the mould for the production of a replica of the other part, and the complex of two complementary parts thus can serve as the mould for the production of duplicates of itself.

— Linus Pauling