"It seems that MCR1 is involved in central functions in the brain, and we know that subgroups like MC2R, MC3R and MC4R, which are also linked to redheads, have considerable involvement in brain functions. This could be the key to explaining why redheads are a little different to other people," says Arendt-Nielsen.
A range of differences
An increasing number of studies show that redheads are differently constituted in terms of pain perception and body reactions. Research reveals that redheads:
are more sensitive to cold
are less responsive to subcutaneously administered anaesthetics [under the skin]
suffer more from toothaches and are more frightened of dentists
are at greater risk of developing sclerosis and endometriosis
http://sciencenordic.com/redheads-fe...rent-kind-pain
------------------------------