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. 2020 May 14;22:114. doi: 10.1186/s13075-020-02205-z

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Immune-reactivity of serum human antibodies with gingipain domains. Sera from patients with RA (n = 155) or with PD (n = 48) were tested for reactivity with recombinant proteins corresponding to the HA1 (a), HA2/3 (b), HA4 (c), and CD (d) gingipain domains of P. gingivalis by ELISA. Sera from normal subjects (n = 35) were used as controls. Antibodies of the IgG isotype are shown on the left, and IgA antibodies on the right side of each panel. Values above the mean + SD were considered significant. *p < 0.05; **p < 0.05; ***p < 0.001; and ****p < 0.0001