igf-1 lr3 receptor grade vs media grade Human IGF-I (Receptor Grade) LR3-IGF-I (Receptor Grade), Human -

Proc Natl Acad Sci U S A 1997

References Guevara-Aguirre J, Balasubramanian P, Guevara-Aguirre M, Wei M, Madia F, Cheng CW, Wei M, Hwang D, Martin-Montalvo A, Saavedra J, Ingles S, de Cabo R, Cohen P, Longo VD: Growth hormone receptor deficiency is associated with a major reduction in pro-aging signaling, cancer, and diabetes in humans

M., Caldwell, J

Consequently, in a further, especially preferred embodiment of the present invention, step b) occurs in a blood collection tube pre-filled with the maleimide, in order to allow for immediate alkylation of GSH in the blood sample (when the blood is freshly drawn from the patient)