Date: September 25, 2019 Source: American Chemical Society

researchers have engineered genetically encoded protein crystals that can generate magnetic forces many times stronger than those already reported.

Each crystal contained about five billion iron atoms and generated magnetic forces that were nine orders of magnitude stronger than single ferritin cages. By introducing crystals that were pre-loaded with iron to living cells, the researchers could move the cells around with a magnet.

https://www.sciencedaily.com/releases/2019/09/190925083802.htm

Hat tip Jimstone.is