Two electrophoretograms of subcellular fractionation of 8701-BC cells: A (cyto-membrane fraction) and B (cytosol fraction). The spots corresponding to the 38 identified proteins (table 1,2,3,4) are indicated with arrows. The spots corresponding to peptides that segregate preferentially in one of the two fractions are named and pointed with arrows in each electrophoretogram. The unknown peptides (see table 5) are not indicated. Circles indicate spots not detected in the map of the total cell lysate and at present not identified.