J. MICHAEL BISHOP
FDC honoring Emily Bissell signed by the Nobel Prize-winner for Physiology or
First Day Cover signed: "J M Bishop", 6½x3¾. FDC honoring Emily Bissell, 15-cent stamp
affixed, postmarked Wilmington, Delaware, May 31, 1980, FIRST DAY OF ISSUE.
Background of Bissell imprinted on verso. Bishop (b.1936), an American immunologist and
microbiologist, shared a Nobel Prize for Physiology or Medicine in 1989 with Harold E.
Varmus "for their discovery of the cellular origin of retroviral oncogenes". In other words,
they discovered that retroviruses can cause malignant tumors. Bishop, who won the
National Medal of Science in 2003, has been on the faculty of the University of
California/San Francisco since 1968, its chancellor since 1998. Lightly soiled. Fine condition.