The Hunting of the Reaction Conduits

[HerscheltheHerschel]

A reaction conduit is a conduit whose input and/or output is a reaction between 2 or more objects.
For example, here is a loaf predecessor + Herschel to beehive:

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x = 13, y = 4, rule = B3/S23
2bo2bo$2bo2bobo3b2o$3o2b3o3b2o$7bo!

Loaf predecessor + Herschel to pre-pulsar + unnamed:

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x = 8, y = 10, rule = B3/S23
2bo2bo$2bo2bobo$3o2b3o$7bo5$6b2o$6b2o!

Sometimes, the said objects in the reaction might be perturbed by catalysts before they even react. I don't have any current example of these.