It's December 25th -- and, of course -- gift-giving time. Give gifts with a dose of wry molecular biology attitude with any of these gifts featuring Holliday junction, a mobile junction between four strands of DNA. Named after Robin Holliday in 1964 to account for a particular type of exchange of genetic information he observed in yeast known as homologous recombination, Holliday junctions are highly conserved structures. Word play on the word "holiday". Make others do a double-take the next time you give any of these gifts with a dose of tongue-in-cheek double-entendre geek humor!

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