Protein

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 1544.7 Hz, 274 cents sharp of E6, the nearest tine on the comb. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Tap to pull it apart. Hands-on: pull a helix out of the fold; let go and it folds back.

Proteins are the tiny machines of living things. Each is a long chain of building blocks called amino acids that folds up into its own shape: coils called helices, flat strands and loops. Hemoglobin carries oxygen in the blood, insulin helps control sugar, and a jellyfish protein, GFP, glows green.

These are real shapes from the Protein Data Bank, a free library of well over 200,000 structures that scientists share. Tap it to pull it apart into its pieces, and they come back by themselves; tap again while it is apart and they come back at once. In GFP the glowing part lights up while it is open. You can open any PDB or mmCIF file from the library in the Splash tab.

This link opens it in the Playground. To put it on your own page, add the element and one script tag. Every option.