Which pair of species are both bases in the following reaction? 
Definitions:
Blood Cells
Cells that circulate in the bloodstream, comprising red blood cells, white blood cells, and platelets.
Elephantiasis
A tropical infectious disease caused by filarial worms, characterized by severe swelling of the limbs and genitals.
Nematode Larvae
The juvenile form of nematodes, which are parasitic or free-living roundworms, undergoing several stages before reaching adulthood.
Lymphatic Ducts
Large vessels in the lymphatic system that transport lymph from the lymph nodes to the veins.
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