He planned to collaborate with leading artists and musicians (Björk was one of the names on his wishlist).
In prior interviews, Mr. Cannon, Mr. White and Mr. Fakahany said they had planned to collaborate in ventures in other American cities and Asia, and were to have explored the opening of casual takeout restaurants.
The companies said they planned to collaborate first on small and midsize cars, crossovers and so-called multipurpose vehicles, and were also considering creating an architecture for low-emission vehicles.
Sean Garrett, a spokesman for Twitter, would not address the rat issue specifically, but said in an e-mail that the company was "very aware of the perennial issues" in the area and planned "to collaborate on improving the neighborhood for both new entrants and longtime residents".
Researchers in Germany said Thursday that they planned to collaborate with an American company in an effort to reconstruct the genome of Neanderthals, the archaic human species that occupied Europe from 300,000 years ago to 30,000 years ago until being displaced by modern humans.
Wilmut had planned to collaborate with Hwang to derive new patient-matched cell lines.
