This research was supported in part by grants from the National Science Foundation (DEB 77-03257, PCM 81-03250, and DEB 00-80921). It is dedicated to Dr. Robert W. Rasch for his continuing encouragement and to Dr. Hewson Swift who mentored my introduction to cytophotometry more than 50 yr ago. I also thank Neil Woodward, David Edwards, Amber McCullough, and Deborah Lee for their expert help in my research program.
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