[Histonet] Enzyme stains

[BennettW <@t> pac.dfo-mpo.gc.ca]

Hello Histonetters,

Does anyone know if there is anything that will stain an enzyme called
cathepsin.  This is an enzyme that is produced by a myxobilatus sp. parasite
(Kudoa thyristes) found in fish.  The parasite produces this protealytic
enzyme.  My preliminary searches haven't revealed too much more than that.  

Any help would be great.

Cheers
Bill Bennett
Histologist
Fisheries and Oceans Canada