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ActRIIB-Fc does not extend survival of SMA mice. (A) Average total righting time, (B) average position score, (C) total number of pulls, (D) total latency to fall time on the hind-limb suspension test, (E) weights and (F) Kaplan–Meier survival curves of vehicle-treated (n = 21) and ActRIIB-Fc-treated SMA mice (n = 20) (Log rank P = 0.008).
