Expression of Concern: Regulation of Brown Fat Adipogenesis by Protein Tyrosine Phosphatase 1B.

This document is an expression of concern regarding a published article titled "Regulation of Brown Fat Adipogenesis by Protein Tyrosine Phosphatase 1B." Concerns were raised about the results presented in Figures 1 and 5, specifically regarding similarities in certain bands. The corresponding author stated that they were not aware of any manipulation of the figures and that the original data is no longer available. Supporting data from repeat experiments were provided, but without the original underlying data, the concerns cannot be fully resolved. The document also includes links to supporting information and data provided by the corresponding author. [Extracted from the article]