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Loading and release of nerve growth factor (NGF) from the heparin-based microscale cryogel scaffolds. (a) shows that almost all of the NGF was loaded from the loading solutions (500 ng/mg of cryogel or 1000 ng/mg of cryogel) to the cryogel scaffold and was slowly released (b) over a period of 2 weeks (longest time analyzed) (n = 3) (error bars represent the cumulative value of standard deviation).
