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J Neurosci Res 66:981991 Murthy CR, Rama Rao KV, Bai G, Norenberg MD (2001) Ammonia-induced production of free radicals in primary cultures of rat astrocytes

So, it's going through a transporter called the Mfsd2a transporter

In accord with these results, TSC2 protein levels determined immunohistochemically were higher in hypertrophic chondrocytes of the CartIR / mice compared to controls (Figure 5b)

Third, PA calcification has been linked to hypoxia, in that hypoxia decreases the expression of serine protease granzyme B stored in the granules of T lymphocytes and natural killer cells, which inhibits store-operated calcium channels (SOCCs) as the main source of calcium mineral by attenuating non-canonical Wnt signals in SMCs, thus increasing calcification of the PA (141)