You can find academic and industrial groups doing some relevant work, but there isn't a focus on building complex molecular systems. In that respect, Japan is first, Europe is second, and we're third.
-- K. Eric Drexler
   
K. Eric Drexler   Name:
K. Eric Drexler
Type:
Scientist
Nationality:
American
Birth:
April 25, 1955
https://www.nutquote.com/quote/K._Eric_Drexler