http://citizensciencequarterly.com/2011/09/12/lego-electrophoresis-box/

Gel electrophoresis is a molecular biology technique that is often used to visualize, purify, or separate DNA based on the size of the DNA molecules inside a solution. It uses an electric current to force charged DNA molecules to migrate through a porous gel that restricts the DNA strand’s movement based on the size of the strand.

And now it’s in LEGO. These are images of an electrophoresis apparatus made out of LEGO blocks. Unlike Lt.Cmdr Data it’s not fully functional though – it would have to be modified to include electrodes. You’d have to drill a few holes into the LEGOs, but you could have your own electrophoresis apparatus for the price of a few plastic blocks.