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This process is thought to have been quite common in the early Universe, during the period when most spheroids were forming.

A team of researchers from Penn State have developed a novel bioprinting technique that uses spheroids, which are clusters of cells, to create complex tissue.

Following this, they analyzed the monkeys' hearts at the tissue level to assess whether cardiac spheroids could regenerate the damaged heart muscles.

These spheroids can then be arranged in any geometry, and the cells of the different units combine seamlessly to form a uniform, living tissue.

Researchers have now shown that this is possible in mice by transplanting small 3D cell cultures of liver cells, known as spheroids, into the anterior chamber of the eye.