Related to my last question regarding rates describing synthesis of post-translational POMC polypeptides...There are a number of biological and biomedical ontologies available through the Internet. Is there one or two you use or can recommend as a source to finding data regarding metabolic rates, cellular concentrations, receptor/cell, or any other metabolic parameters useful for numerical modeling of metabolic and physiological pathways? Have you found them easy to use? Have they been helpful and in what way?