1. Two-color immunofluorescence using a fluorescence-activated cell sorter.
2. 2. C. Stewart, 1992 . Provision of Figure1 and its description.
3. 3. R. Hoffman, 1992 . Personal communication.
4. 4. W. H. Press. 1989 . Numerical Recipes in C , p. 32 -46 . Cambridge University Press. London/New York.
5. 5. H. M. Shapiro, 1993 . This volume.