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This item sold on May 2, 2013.

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Do you have a special someone in your life? Show them you care with this card, likening your bond to the strongest of DNA's basepairs. Be it the love of your life, a best friend, or a great lab partner, they'll know you really mean it when you tell them "we go together like cytosine and guanine."

Cytosine and guanine are two of the four nucleic acids that make up our DNA, the C and G of A, T, C, and G. Hydrogen bonds are the forces that hold our molecules of DNA together, and while an A-T bond has only two hydrogen bonds keeping them together, a C-G bond has three.

Your 3.5" x 5" card will come with a matching blue OR green envelope. Please indicate or preference, or you will receive whatever gets pulled out of the random color generator. Off-white also available upon request.

Each card was lovingly printed on a century-old Chandler and Price letterpress machine. Unlike today's standard forms of printing, letterpress provides a rich textural experience due to the physical impression of an inked surface into the paper--printed areas have a smooth sheen that plays nicely against the backdrop of subtly textured paper.

Letterpress was the everyday form of printing text from its invention by Johannes Gutenberg in the mid-15th century until the 19th century--think movable lead type. Today, advances in photopolymer chemistry allows printers to easily convert digit images to the physical plates used on these antique machines. Yay science!

I welcome international buyers! Just convo me for a shipping quote.

DNA basepair letterpress greeting card, scientists in love -- We go together like cytosine and guanine

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