Until August <a href=" http://rc-lab.co.uk/how-to-order#rome ">erythromycin 250mg 5ml</a> But creating an engaging museum exhibit about genetics isn't exactly easy: Even when magnified to hundreds of times its microscopic size, DNA is, at its heart, a series of bonded chemicals. The best visual representation of it is a bunch of A's, C's, T's and G's (for adenine, cytosine, thymine and guanine, respectively, the four "nucleic acids" that make up every single living thing on Earth).