In “Molecular Size and Subunit Structure of the Fourth Component of Guinea Pig Complement” by Robert E. Hall and Harvey R. Colten in the May issue of the Journal of Immunology, Volume 118, Number 5, page 1903, second column, 13th line from the bottom, “sodium deoxycholate” should read “1% sodium deoxycholate”.

On page 1904, first column, second line, “500 mM Tris HCl” should read “50 mM Tris HCl.”

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