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If you continue to feel pain in the area youve put the needle in whilst you are injecting your factor, check to make sure the needle is still in the vein, by gently pulling back on the syringe plunger so see if any blood flows back into the butterfly tube if it doesnt the needle may no longer be in the vein and you may be "tissuing where the factor just gets trapped under the skin rather than going in to the bloodstream

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Preclinical work has reported a distinct selectivity profile, with growth hormone stimulation observed at concentrations that did not trigger ACTH or cortisol secretion, making it a useful tool for isolating growth hormone-specific signalling without activation of the hypothalamic-pituitary-adrenal axis

Piao, L