We might get to see it... Or at least a laboratory extracted version of it. I went to
PubMed
and entered the mushroom name (Agaricus Blazei Murrill), and got summaries of 11 different studies.
To run your own search, click the PubMed link and enter the mushroom name. You'll get a list of abstracts. You can search deeper and find the exact
components of the fungus, if it's been listed. I haven't checked yet, so it might not have been broken down yet.