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Researchers believe that a particular group of genes, the major histocompatibility complex, play a large role in scent production.

While that statistic might not enhance the mood, the special sharing is thought to be helpful in sampling the partner’s histocompatibility genes involved in immune response.

But length and quality of survival are directly related to closeness of histocompatibility between donor and recipient, a factor on which future operations should be made to depend.

One possibility is to use gene editing to remove the markers on transplanted cells, called the major histocompatibility complex, that red-flag them for the host’s immune system.

A common inhibitory receptor for major histocompatibility complex class I molecules on human lymphoid and myelomonocytic cells.