Primary journal letter by Rodney Robert Porter, printed as R. R. Porter, in Nature 182, pp. 670–671, published 6 September 1958. DOI: 10.1038/182670a0.
Inspected passage: the publisher’s opening paragraph describes the earlier papain-powder digestion of rabbit anti-ovalbumin, loss of direct precipitation, and specific inhibition of precipitation with undigested antiserum. This earlier preparation is distinct from the later crystalline-papain procedure. The PDF endpoint served publisher HTML containing that paragraph and metadata; the entire two-page paper was not inspected. No apparatus dimensions, buffer recipe or measurements are inferred from unseen pages.

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