GRIN2B and Tinnitus: However, NR2B mRNA levels were significantly decreased in the cochlea (2.8±0.3 versus 3.7±0.5, p<0.001) and IC (1.0±0.7 versus 1.6±0.6, p = 0.001) of the Spirulina group and the C-PC group (cochlea: 2.5±0.3 versus 3.7±0.5, p<0.001; IC: 0.8±0.2 versus 1.6±0.6, p<0.001) compared to the tinnitus group (Figure 2).