Channel-type facilitator

Reaction: 
zn2[e] -> zn2[c]
Metabolites: 
Reaction: 
k[e] -> k[c]
Metabolites: 
Reaction: 
no2[e] -> no2[c]
Metabolites: 
Reaction: 
for[e] <=> for[c]
Metabolites: 
Reaction: 
k[e] + h[c] -> k[c] + h[e]
Metabolites: 
Reaction: 
mg2[e] -> mg2[c]
Metabolites: