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The Ki is the concentration of the competing ligand that will bind to half the Cheapest Generic Lasix sites Buying Lasix Online equilibrium, in the absence of radioligand or other competitors.
Researchers as well as athletes and bodybuilders know that besides the two principal physiological androgens, testosterone and dihydrotestosterone, there exist a number of synthetic anabolic-androgenic steroids (AAS) that exhibit diverse biological actions. These are then inserted into a cell.
The researchers did not measure the EC50 of testosterone because it metabolized to the relatively inactive androgen androstenedione by the enzyme 17beta-hydroxysteroid dehydrogenase present in the type of cells used in the experiment.
Surprisingly, despite the number of synthetic AAS that have been developed, their modes of action are poorly understood. In other words, the structures of androgen responsive genes vary in such a way that some genes are more readily activated by certain androgens than by others. Finally, to test the in vivo strength of the various steroids, rats were injected with each steroid at a dose 0.3 mg/kg of body weight. Methyltrienolone binds extremely strongly to the AR and to what degree it can be displaced from the AR serves as the standard assay for measuring the binding strength of any given androgen receptor ligand. For example, dihydrotestosterone binds the androgen receptor much more strongly than does testosterone at the same concentration, yielding a higher degree of ligand-receptor stability. Both stanozolol and methanedienone were the least effective competitors with a Ki for stanozolol of 4.5nM and methanedienone of 5.0 nM. This holds for the naturally occurring androgens as well. In [2] the difference was 30%.