| Rf | in paper or thin-layer chromatography, the distance that a spot of a substance has moved from the po... |
|---|---|
| YS | yellow spot; yolk sac |
| ys | yellow spot; yolk sac |
| CEM | computerized electroencephalographic map; conventional transmission electron microscope |
| EM | early memory; ejection murmur; electromagnetic; electron micrograph; electron microscopy, electron m... |