STATENS SERUMINSTITUT

AMAGER BOULEVARD 80

Pa ; : COPENHAGEN, S. DENMARK: ‘ mL
, an ' The International Escherichia Centre
DIRECTOR: P. VON MAGNUS, MB. - . . .. TELEGRAMS: STATSSERUM
: can , : Re Yo TELEPHONE: ASTA:- 284.77 >
March 21,1962
Professor Joshua Lederberg . MG ~

Dept.of Genetics
Stanford University Medical School
Palo Alto,California

 

Dear Esther and Josh,

Here ave some few prints from my too short stay in Palo Alto Octo-
ber last year.el am surprised that it is possible to make such ra-«
ther nice prints from such poor diapositives;they were all of them
taken at the time of sunset.How I enjoyed those days.

I understand from the invitation that Dr. Kauffmann received some
days ago from Luria that I (or we) shall not get a chance to see
you this year at the workshop. (We saw your name and thas of Tino
on the list).By the way Kauffmann declined the invitation,he says
that be is too old for that type of m eeting.But we shall hos

for next year then.Till then we should have collected some more

data on the socalled thermolabile coli antisens (L,M and others) cee
including the fertility factors. : ~
The systematic coli © antigen polysaccaride analysis which we

carry out in collaboration with Dr.Westphal since last sumuer Le

should also be more complete next year. an
We feel that our work here prorresses guite well. “ur collabo-
ration with Hirota has already been rewarding.The two R factors
which we have examined up till now have deepgoing influences
on the surface Dppoperties of receptor strains.Also influences
~~ Dn &
on theYf+ entigen,.
We had our first electron micrographs of coli K+ orzanisms covered
with ferritin cbnjugated K+ antibody some few weeks ago and hone

next wack to ret the first pictures of t*s lo c'tion of the F

f+ antircens This was just some few romarks about our work
here right now. Life is rather quiet cn¢ we enjoy our new
home and hone that sprine will soon come. Tf this Istter is
send on to Japan piease give our very best rerarcds to Tino.
Yours
L

[komo Wn, Wty