Label-free morphology-based phenotypic analysis of spinal and bulbar muscular atrophy muscle cell models - Kenji Sakakibara; Kenjiro Tanaka; Madoka Iida; Yuta Imai; Mai Okada; Kentaro Sahashi; Tomoki Hirunagi; Kentaro Maeda; Ryuji Kato; Masahisa Katsuno (Disease Models & Mechanisms)