The obvious initial inference to make about a test that does not pick up a difference where you expect one is that it is not a very good test.

NEWYORKER: Live and Learn

But he said that the reasons for humans becoming addicted to any drug were more complex than simply their genetic make-up, and that a test for any gene uncovered by further research would not necessarily work.

BBC: NEWS | Health | Key differences in addicts brains

It is always interesting to see what clues the selection offers about the possible make-up of the Test team and there are a couple of combinations that look like they might be used in the Tests.

BBC: Jeremy Guscott column

Dr Ingrid Winship, another member of the research team, said a test could inform women with a family history - who make up between 10% and 30% of cases - if they were at risk.

BBC: Premature menopause 'gene found'

As a result, up until now, only those large firms have had access to the ability to quickly make and test these types of algorithms.

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Birmingham came close to equalising when Heskey raced through to test Jaaskelainen with a cleanly-struck effort, but the Bolton keeper stood up well to make the block.

BBC: Birmingham City 1-2 Bolton