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Meanwhile, Belfast-based fertility firm Examen uses a technique known as single cell gel electrophoresis to identify DNA damage in individual sperm.

This week, Sims said he had students at home do a virtual gel electrophoresis activity.

In the first week, I was assigned a few simple molecular-biology tasks: performing a polymerase chain reaction and analysing samples using gel electrophoresis.

That alters how the RNA behaves in a common lab procedure known as gel electrophoresis, making it easy to detect.

Righetti is known in the world of proteomics for his work on electrophoresis, a process that helps to sort molecules by size and by electrical charge.