Retraction Note: Pharmaceutical Research volume 25, Article number: 2731 (2008)
The Editor-in-Chief has retracted this article . A report (https://ori.hhs.gov/content/case-summary-yakkanti-sudhakar) by the US Office of Research Integrity has concluded that the image shown as the protein band tumstatin (α3(IV)NC1) in Fig. 2 (lanes 2–4) was also used in  to represent a different experiment. The Editor-in-Chief therefore no longer has confidence in the conclusions presented in this article. Akulapalli Sudhakar does not agree with this retraction. The Editor-in-Chief was not able to obtain a current email address for Chandra S Boosani.
Akulapalli Sudhakar & Chandra S. Boosani. Inhibition of Tumor Angiogenesis by Tumstatin: Insights into Signaling Mechanisms and Implications in Cancer Regression. Pharm Res 25, 2731 (2008). https://doi.org/10.1007/s11095-008-9634-z
Akulapalli Sudhakar, Aruna Ramachandran, Sudip Ghosh Seyed E. Hasnain, Randal J. Kaufman and Kolluru V. A. Ramaiah. Phosphorylation of Serine 51 in Initiation Factor 2α (eIF2α) Promotes Complex Formation between eIF2α(P) and eIF2B and Causes Inhibition in the Guanine Nucleotide Exchange Activity of eIF2B. Biochemistry 2000; 39(42):12929-12938
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The online version of the original article can be found at https://doi.org/10.1007/s11095-008-9634-z
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Sudhakar, A., Boosani, C.S. Retraction Note: Inhibition of Tumor Angiogenesis by Tumstatin: Insights into Signaling Mechanisms and Implications in Cancer Regression. Pharm Res 38, 377 (2021). https://doi.org/10.1007/s11095-020-02974-x