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- This research was supported in part by an N.S.F. Graduate Trainee Fellowship and by an N.I.H. Public Health Service Fellowship, no. 1‐F01‐GM43579–01. It is based upon a portion of a thesis submitted in partial fulfillment of the requirements for the Ph.D. degree in biological sciences at Northwestern University, Evanston, Illinois.
- Dept of Biology, California State Univ., San Diego, Calif. 92115, U.S.A.