Human cells have been turned partially transparent in a laboratory. 
A species of squid known as Doryteuthis opalescens uses proteins called reflectins to alter its transparency and become 'invisible' to predators through camouflage.
Researchers from the University of California Irvine in the US harvested these colour-changing proteins and injected them into human kidney cells.  
This resulted in the human cells becoming partially transparent. 
Researchers say the technique could be used by other scientists to get a clearer view of the processes inside living cells and zubna klinika tissues.  
















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Pictured, a graphic showing the role of leucophores in squids. In leucophores there are several proteins, including one called reflectin A1, which alter how much light is reflected and transmitted through the cell.





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Pictured, a graphic showing how the reflectin proteins (yellow circles) were inserted into human cells and how they can influence transmission and reflection through a cell 

Both lie between the muscle and the upper layer of skin, called the epidermis.

Chromatophores sit directly on top of leucophores.  
In leucophores there are several proteins, including one called reflectin A1, which alter how much light is reflected and transmitted through the cell. 
The squid can activate these cells at will, by rearranging the reflectin proteins to either reflect or transmit light.

If light is fully transmitted, it appears transparent. 
The Doryteuthis opalescens has a stripe on its head which turns white, from transparent, when these proteins are activated. 
Scientists inserted these proteins into embryonic kidney cells and used concentrations of salt to trigger them. 
The arrangement of the proteins then changes and alters how much light is scattered and made the cells more transparent.