March 28, 1968
Dear Maxine,
I am giving a series of courses to students and, as before, I have to say that maybe PNPase from L.arabinosus is in the particulate part of the cell.  I shall be going to Israel this September and I shall really be ashamed to repeat the same thing again; so I am reminding you your promise to look into this. If you don't want to be bothered or don't have the time, I shall be happy to do so and give you the results if you send me a strain.
Except for the courses, which are a pain in the neck,  I am feeling fine. I have spent almost the last month writing a paper on Q13 PNPase which has a 200 000 enzyme stimulated by manganese, as reported by Buchanan and which phosphorolyzes very poorly, and a 100 000 enzyme which does phosphorolyze.
We also did electron micrographs of the enzyme, with Valentine of London, and PNPase seems to be an hexamer : two trimer forming a triangle one over the other.  We are now studying the subunits.
I hope to see you before, but in any case I am looking forward to seeing you in Greece.
All the best to you and the family
Marianne