1963: Sager and Ishida isolate cloroplast DNA
from Chlamydomonas.
1961: "Cell Heredity", R. Sager and
F. J. Ryan, John Wiley & Sons, New York
1970: Sager, and Ramanis publish the first
genetic map of (eight) non-Mendelian genes
(which reside on a chloroplast
chromosome of Chlamydomonas).