science museum

Looking at it

If your DNA is extracted from your blood, and cut up using enzymes, the result is a mixture of about 1.5 million DNA pieces of different lengths. Scientists can separate this mixture on a gel. To look at a particular piece of DNA, they first have to transfer it from the wobbly gel to a tough nylon membrane. This technique is called Southern blotting after its inventor, biologist Ed Southern from Oxford University.

Southern blotting.
Southern blotting.
Science & Society Picture Library

Science Museum Home Page Who am I? Science Museum Home Page