( ( ( A ( single leaf ) ) ( treated ( under ( these conditions ) ) ) ) ( ( may ( ( ( yield ( ( tens ( of millions ) ) ( of ( single cells ) ) ) ) , ) ( each ( theoretically ( capable ( of ( eventually ( producing ( a ( whole plant ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (JJ single) (NN leaf)) (VP (VBN treated) (PP (IN under) (NP (DT these) (NNS conditions))))) (VP (MD may) (VP (VP (VB yield) (NP (NP (QP (NNS tens) (IN of) (NNS millions))) (PP (IN of) (NP (JJ single) (NNS cells))))) (, ,) (NP (NP (DT each)) (ADJP (RB theoretically) (JJ capable) (PP (IN of) (S (ADVP (RB eventually)) (VP (VBG producing) (NP (DT a) (JJ whole) (NN plant))))))))) (. .)))
A single leaf treated under these conditions may yield tens of millions of single cells, each theoretically capable of eventually producing a whole plant.
(ROOT (S (NP (NP (DT The) (NN amount)) (PP (IN of) (NP (NP (NN product)) (SBAR (WHNP (WDT that)) (S (VP (MD may) (VP (VB be) (VP (VBN produced) (PP (IN by) (NP (DT a) (NN reaction))) (PP (IN under) (NP (VBN specified) (NNS conditions))))))))))) (VP (VBZ is) (VP (VBN called) (NP (JJ theoretical) (NN yield)))) (. .)))
The amount of product that may be produced by a reaction under specified conditions is called theoretical yield.