Fig. 1. Cultures of human fetal cells used for microarray analyses. (A,B) Primary myoblast cultures from sample 7 and 2, respectively. (C,D) Immunofluorescence staining of myoblasts (sample 2) using an anti-desmin antibody (red), with nuclei counterstained with DAPI (blue). (E,F) Examples of `early' (E) and `late' (F) myotubes at the time of RNA harvesting for microarray analyses (sample 2). Magnification, 200x (A,B,E,F); 400x (C); 630x (D).