Retraction of: Ultrastructural immunohistochemical study of L-type amino acid transporter 1–4F2 heavy chain in tumor microvasculatures of N-butyl-N-(4-hydroxybutyl) nitrosamine (BBN) induced rat bladder carcinoma

Microscopy, 2024, 73(5), 456 DOI: https://doi.org/10.1093/jmicro/dfae033 Advance Access Publication Date: 6 August 2024 Retraction Retraction Retraction of: Ultrastructural immunohistochemical study of L-type amino acid transporter 1–4F2 heavy chain in tumor microvasculatures of N-butyl-N-(4-hydroxybutyl) nitrosamine (BBN) induced rat bladder carcinoma were announced on the Azabu University and JSPS websites on 24 November 2022 and 14 April 2023, respectively. The editors and the publisher became aware of the findings in November 2023. The investigative committees of Azabu University and JSPS raised concerns about Figures 1–5, and the corresponding author was unable to provide sufficient evidence to support their scientific validity. The investigative committee of Azabu University also concluded that the third author had been inappropriately listed as a co-author after acceptance of the article, without having contributed to the research or the preparation of the manuscript, and without their consent. The authors do not agree with this retraction. © The Author(s) 2024. Published by Oxford University Press on behalf of The Japanese Society of Microscopy. All rights reserved. For commercial re-use, please contact for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site–for further information please contact . This is a retraction of: Eisuke Kume, Tomoko Mutou, Norio Kansaku, Hitoyuki Takahashi, Michael F. Wempe, Masahiro Ikegami, Yoshikatsu Kanai, Hitoshi Endou, Shin Wakui, Ultrastructural immunohistochemical study of L-type amino acid transporter 1–4F2 heavy chain in tumor microvasculatures of N-butyl-N-(4-hydroxybutyl) nitrosamine (BBN) induced rat bladder carcinoma, Microscopy, Volume 66, Issue 3, June 2017, Pages 198–203, https://doi.org/10.1093/jmicro/ dfx008 The above referenced article has been retracted by the editor following investigations conducted by the investigative committee of Azabu University and the Japan Society for the Promotion of Science (JSPS). The results of the investigations  (...truncated)