Editing 1990 in science (section)

==Physiology and medicine==
* June 25 – ''[[Cruzan v. Director, Missouri Department of Health]]'' decided in the [[Supreme Court of the United States]] allowing public officials to intervene in questions of termination of life support in the absence of an [[advance healthcare directive]].
* The [[Human Genome Project]] is founded.
* The first evidence for the existence of the [[BRCA gene]] encoding for a DNA repair enzyme involved in breast cancer susceptibility Is provided by [[Mary-Claire King]]'s laboratory at [[University of California, Berkeley]].<ref>{{cite journal|author1=Hall, J. M.|author2=Lee, M. K.|author3=Newman, B.|author4=Morrow, J. E.|author5=Anderson, L. A.|author6=Huey, B.|author7=King, M. C.|title=Linkage of early-onset familial breast cancer to chromosome 17q21|journal=[[Science (journal)|Science]]|volume=250|issue=4988|pages=1684–9|date=December 1990|pmid=2270482|doi=10.1126/science.2270482|bibcode=1990Sci...250.1684H}}</ref>