Changes

:::::::: '''''"To allow others to replicate and build on''' work published in PNAS, authors must..."'' Out of curiosity, which part of his experiment are you trying to replicate that need additional information not available in the paper? Maybe you should tell him, he could easily help you with that. If you are not replicating the experiment, then did you have a real question or concern, or a weakness that you identified, like "I had a concern about this-and-that procedure of the strain selection, it seems particularly vulnerable to contamination" he would be quite happy to help you too. But hey, that requires that you have a clue about the subject matter.

:::::::: '''''"To allow others to replicate and build on''' work published in PNAS, authors must..."'' Out of curiosity, which part of his experiment are you trying to replicate that need additional information not available in the paper? Maybe you should tell him, he could easily help you with that. If you are not replicating the experiment, then did you have a real question or concern, or a weakness that you identified, like "I had a concern about this-and-that procedure of the strain selection, it seems particularly vulnerable to contamination" he would be quite happy to help you too. But hey, that requires that you have a clue about the subject matter.

==== Scientific Scrutiny and Disclosure ====

==== Scientific Scrutiny and Disclosure ====