Those with NUMBER@1 to NUMBER@2 times the concentration present in blood plasma include the brain , spleen , lung , testicle , lymph nodes , liver , thyroid , small intestinal mucosa , leukocytes , pancreas , kidney and salivary glands .

The brain , spleen , lung , testicle , lymph nodes , liver , thyroid , small intestinal mucosa , leukocytes , pancreas , kidney , and salivary glands usually have NUMBER@1 to NUMBER@2 times the concentration present in plasma .
