Signature events

A letter from many university and college presidents went to President Trump on March 16 urging protections for DREAM students. You can find the letter at:

http://www.acenet.edu/news-room/Documents/Letter-From-Institutions-to-President-Trump-on-Dreamers.pdf

Among the signatures:

University of California, Berkeley
University of California, Davis
University of California, Irvine
University of California, Los Angeles
University of California, Merced
University of California, Riverside
University of California, Santa Cruz

Not found:

UC-San Francisco
UC-San Diego
UC-Santa Barbara

Yours truly noticed that there was no signature from UC systemwide and thought it was because UC was a system, not a single entity. But then he found University of Illinois System on the list of signatures. There may be explanations.