When is CBS an ammonia risk or not

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I find so contradicting info about CBS C699T being or not an ammonia risk.
? is C699T AG +- an ammonia issue at all or is it only C699T AA ++ ?
rs2851391 CBS A13637G CT +/-
rs1801181 CBS A360A AG +/-
rs706209 CBS C*351T AG +/-
rs4920037 CBS C19150T AG +/-
rs234706 CBS C699T AG +/-
rs12613 CBS G*299A CC -/-
rs706208 CBS T*330C AG +/-
Thanks
 

Valentijn

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I find so contradicting info about CBS C699T being or not an ammonia risk.
There's no research showing it to be a risk. Yasko believes that it is, due to equating a mild up-regulation of the gene with the effects of the removal of half of the entire gene. Her claim is baseless, and quite bizarre.