When mice have the PER1 protein removed from their kidneys, their daily salt excretion rhythm stays normal even with a high-salt diet and hormone treatment. This finding is from the abstract summary - full study details were not available

When mice have the PER1 protein removed specifically from their kidneys, they retain more salt when given a high-salt diet and a hormone treatment, which could affect blood pressure regulation. This finding is from the abstract summary - full study details were not available

Mice with kidney-specific PER1 removal show higher levels of a hormone that regulates salt and blood pressure. This finding is from the abstract summary - full study details were not available

When rats had a part of their brain (SFO) removed, they kept less salt in their bodies during the first few days of eating a very salty diet, meaning that part of the brain helps control how the body handles extra salt.