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We read with interest the letter to the editor by Massier et al 1 and the accompanying response by Fasano.2 We would like to point out one critical issue that has not been addressed, namely, the relationship between AT1001, zonulin and prehaptoglobin-2. AT1001 is an octapeptide that was thought to represent the N-terminal sequence of zonulin.3 4 However, in all likelihood this octapeptide sequence (GGVLVQPG) derives from immunoglobulin. In their attempt to identify the human homolog of the Vibrio cholera zonula occludens …
LMS and FK contributed equally.
Contributors LS and FK are equal contributors to this article.
Funding LMS is funded in part by the Stiftelsen KG Jebsen (SKGJ-MED-017) and a grant from the South-Eastern Norway Regional Health Authority (project #2020027). FK is funded in part by the collaboration project TIMID (LSHM18057-SGF) financed by the PPP allowance made available by Top Sector Life Sciences and Health to Samenwerkende Gezondheidsfondsen (SGF).
Competing interests None declared.
Patient and public involvement Patients and/or the public were involved in the design, or conduct, or reporting, or dissemination plans of this research. Refer to the Methods section for further details.
Provenance and peer review Not commissioned; internally peer reviewed.
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