Retraction Note: Amino Acids (2012) 42:1669–1683

https://doi.org/10.1007/s00726-011-0869-3

The Editor-in-Chief has retracted this article. After publication, it was brought to the attention of the Editor-in-Chief that Fig. 4 of this article appears to be identical to Fig. 2C of a previously published article (Das et al. 2010) by the same author group. Additionally, this article also contains material that substantially overlaps with previously published articles by the same author group (Ghosh et al. 2010; Das et al. 2008).

Pabitra Bikash Pal, Joydeep Das, & Parames C. Sil do not agree with this retraction. Sankhadeep Pal has not responded to any correspondence from the publisher about this retraction.