IGF 1 LR3 1MG Beverly Hills Rejuvenation Center Late life targeting of the IGF 1 receptor improves healthspan and lifespan in female mice Nature Communications Frontiers Sheep recombinant IGF 1 promotes organ specific growth in fetal sheep Activation of insulin like growth factor 1 receptor (IGF 1R) promotes growth of colorectal cancer through triggering the MEX3A mediated degradation of RIG I ScienceDirect The Fascinating Interplay between Growth Hormone, Insulin Like Growth Factor 1, and Insulin