Background
Within Interactions, edge tooltips display one or more SIF MEDIATOR_IDS under 'Pathway Links'.

Following link for [1] in this case gives a interaction from CTD

We could certainly provide more useful clues to help a user decide. I personally find detail in these links far more informative.
Ideas
Good: A traverse on each to fetch a list of the participant display names:
"expression of CDKN1A protein",
"CDKN1A protein",
"TP53 protein/HSPB1 protein complex"
Better:?
Best: Max's idea of 'small multiple' preview snapshots