This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/jms.4042 This article is protected by copyright. All rights reserved. Mass spectrometry characterization of endophytic bacterium Curtobacterium sp. strain ER1/6 isolated from Citrus sinensis Francisca Diana da Silva Araújo 1,* , Daiene Souza Santos 2 , Carolina Clepf Pagotto 1 , Welington Luiz de Araújo 2 , Marcos Nogueira Eberlin 1 1 ThoMSon Mass Spectrometry Laboratory, Chemistry Institute, University of Campinas, POB 6154, 13084-970, Campinas, SP, Brazil; and 2 Biomedical Sciences Institute, University of São Paulo, São Paulo, SP, Brazil Correspondence author: F. D. S. Araújo, ThoMSon Mass Spectrometry Laboratory, Chemistry Institute, University of Campinas, UNICAMP, 13083-970, Campinas, SP, Brazil. E-mail: fdsaraujo@gmail.com