<http://schema.org/description>
"All living cells keep their cellular calcium concentration at a very low level. Since a small increase in calcium can affect many critical cellular functions (an elevated calcium concentration over an extended period can induce cell death), powerful cellular mechanisms ensure that calcium concentration quickly returns to its low level."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2013-01-key-mechanism-calcium.html>