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A comprehensive dictionary listing all the people whose names are commemorated in the English and scientific names of birds.

Keener birders will have yearned to see Pallas's Warbler, Hume's Owl, Swainson's Thrush, Steller's Eider or Brnnich's Guillemot.

The gene in question codes for a protein receptor called CCR5.

The HIV virus binds to this receptor before entering cells.

One gene variant, called CCR5-Delta32, has 32 DNA base pairs missing and produces a receptor that HIV cannot bind to, which prevents the virus from entering the cells.

Another theory is that a major disease, such as plague or smallpox, created a selection pressure on the gene variant which increased its frequency.

But its distribution does not match that of disease outbreaks, either.

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