Cited passages: Towbin, Staehelin and Gordon, pp. 4350–4352: Electrophoretic Blotting Procedures, Figure 1, Figures 2–3 and Table 1; Towbin, Staehelin and Gordon, pp. 4351–4353: Immunological Detection of Proteins on Nitrocellulose and Figure 4, including preimmune-serum controls.