[jszymborski]

> These sort of answers do not inspire confidence.

I'm not anything close to a Materials Engineer, but at least in the (very different) fields in which I've published, it's very standard to not share material (e.g.: plasmids, bacteria, code, or datasets) until you've published.

Pre-prints rarely have code or data available if the authors intend to publish elsewhere (again, in my field).

[jacquesm]

Ok, that may well be the explanation then. As long as those samples don't go missing...

[willis936]

The whole point is for the samples to not go missing because they will likely need them in rounds of review.