I-TASSER: including a modified LYS (LYR) in the template

Hi there,

I have a short question: Can I input a template structure with a modified LYS residue such as LYR (LYS+RET) to both the server and the 5.1 suite versions of I-TASSER ? will it then be also teated correctly as the modified residue during the geometry determination?

I'm asking because a paper by Nikolaev et al. 2018 (https://pubs.acs.org/doi/10.1021/acsomega.8b00721) seems to claim that, at least at the time it was published, this resulted in problem for the residue orientations around the LYR region when they used your software.
I was wondering if this has been addressed ever since.

FYI: An example of a PDB with LYR: https://www.rcsb.org/structure/6EID

Thanks in advance !