There are multiple in-text citation errors in the Methods section and Figure Legends. The second sentence in the Methods section under the subheading “Immunoblotting” should end with: “...and Bar209 anti-mono197 and unglycosylated PrP mAb [14] (Fig. S1 and S2), recognizing a conformational epitope [14] likely involving human PrP168-181, like anti-mono197 PrP mAb V61 [12].” The last sentence of the Figure S1 Legend should be: “Bar209 has a conformational epitope (14), which likely involves PrP168–181 as it recognizes PrPC depending on N181 occupancy, like V61 mAb (12).” The first sentence of the Figure S2 Legend should begin: “The following brain homogenates containing different PrP glycoforms were used [21]...”