( Cations ( ( are ( ( one form ) ( of ( regulation ( in ( ( the production ) ( of PAF ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Cations)) (VP (VBP are) (NP (NP (CD one) (NN form)) (PP (IN of) (NP (NP (NN regulation)) (PP (IN in) (NP (NP (DT the) (NN production)) (PP (IN of) (NP (NNP PAF))))))))) (. .)))
Cations are one form of regulation in the production of PAF.
(ROOT (S (NP (NNS Cations)) (VP (VBP are) (VP (VBN formed) (PP (IN by) (NP (NP (DT the) (NN loss)) (PP (IN of) (NP (CD one) (CC or) (CD two) (NNS electrons))))) (PP (IN from) (NP (DT an) (NN element))))) (. .)))
Cations are formed by the loss of one or two electrons from an element.