in addition , blood concentrations of tyr-mif-1-like immunoactivity were nearly doubled in aged rats ( 3.24 +/- 0.373 vs 1.67 +/- 0.0904 pm/ml ) , while blood concentrations of met-enk-like immunoactivity and brain concentrations of immunoactive tyr-mif-1 and met-enk showed no statistically significant difference between age groups .
C0006104
brain
C0086045
concentrations