Medical Research Council notes, labelled 'Book 4/P3' - P3 refers to Potter tumour 3, Jun 1971-1972: Experiments optimizing conditions for an antibody assay for P3 IgG using model IgG kappa chain and antibodies from Cesar Milstein and his student Svasti (15/6). "A" refers to an initial zonal RNA separation. "A, re-run" is a re-run of sucrose gradient fractions of RNA ("A") isolated from…