3 It should be noted that the toxicity (LC50) of a sample observed in a range-finding test may be significantly different from the toxicity observed in the follow-up chronic definitive test  (1) the definitive test is longer; and (2) the test may be performed with a sample collected at a different time, and possibly differing significantly in the level of toxicity.
( 3 ( It ( ( should ( be ( noted ( that ( ( ( ( the toxicity ) ( -LRB- ( LC50 -RRB- ) ) ) ( of ( ( a sample ) ( observed ( in ( a ( range-finding test ) ) ) ) ) ) ) ( may ( ( be ( significantly ( different ( from ( ( the toxicity ) ( observed ( in ( the ( follow-up ( chronic ( definitive test ) ) ) ) ) ) ) ) ) ) ) ( ( ( ( ( ( ( ( -LRB- ( 1 -RRB- ) ) ( ( the ( definitive test ) ) ( is longer ) ) ) ; ) and ) ( ( -LRB- ( 2 -RRB- ) ) ( ( the test ) ( may ( be ( performed ( with ( ( a sample ) ( collected ( at ( a ( different time ) ) ) ) ) ) ) ) ) ) ) ) , ) and ) ( possibly ( ( differing significantly ) ( in ( ( the level ) ( of toxicity ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (LST (LS 3)) (NP (PRP It)) (VP (MD should) (VP (VB be) (VP (VBN noted) (SBAR (IN that) (S (NP (NP (NP (DT the) (NN toxicity)) (PRN (-LRB- -LRB-) (NP (NNP LC50)) (-RRB- -RRB-))) (PP (IN of) (NP (NP (DT a) (NN sample)) (VP (VBN observed) (PP (IN in) (NP (DT a) (JJ range-finding) (NN test))))))) (VP (MD may) (VP (VB be) (ADJP (RB significantly) (JJ different) (PP (IN from) (NP (NP (DT the) (NN toxicity)) (VP (VBN observed) (PP (IN in) (NP (DT the) (JJ follow-up) (JJ chronic) (JJ definitive) (NN test))))))) (SBAR (S (S (LST (-LRB- -LRB-) (LS 1) (-RRB- -RRB-)) (NP (DT the) (JJ definitive) (NN test)) (VP (VBZ is) (ADJP (JJR longer)))) (: ;) (CC and) (S (LST (-LRB- -LRB-) (LS 2) (-RRB- -RRB-)) (NP (DT the) (NN test)) (VP (MD may) (VP (VB be) (VP (VBN performed) (PP (IN with) (NP (NP (DT a) (NN sample)) (VP (VBN collected) (PP (IN at) (NP (DT a) (JJ different) (NN time))))))))))) (, ,) (CC and) (S (ADVP (RB possibly)) (VP (VBG differing) (ADVP (RB significantly)) (PP (IN in) (NP (NP (DT the) (NN level)) (PP (IN of) (NP (NN toxicity))))))))))))))) (. .)))
The toxicity of a sample in the range-finding test will be exactly the same as the toxicity in the follow-up test.
( ( ( The toxicity ) ( of ( ( a sample ) ( in ( the ( range-finding test ) ) ) ) ) ) ( ( will ( be ( ( exactly ( the same ) ) ( as ( ( the toxicity ) ( in ( the ( follow-up test ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN toxicity)) (PP (IN of) (NP (NP (DT a) (NN sample)) (PP (IN in) (NP (DT the) (JJ range-finding) (NN test)))))) (VP (MD will) (VP (VB be) (NP (NP (RB exactly) (DT the) (JJ same)) (PP (IN as) (NP (NP (DT the) (NN toxicity)) (PP (IN in) (NP (DT the) (NN follow-up) (NN test)))))))) (. .)))