( However ( , ( ( ( keep ( in mind ) ) ( that ( ( ( these types ) ( of feedback ) ) ( are ( rather unreliable ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (VP (VB keep) (PP (IN in) (NP (NN mind))) (SBAR (IN that) (S (NP (NP (DT these) (NNS types)) (PP (IN of) (NP (NN feedback)))) (VP (VBP are) (ADJP (RB rather) (JJ unreliable)))))) (. .)))
However, keep in mind that these types of feedback are rather unreliable.
(ROOT (S (NP (JJ Positive) (NN feedback)) (VP (VP (VBZ intensifies) (NP (NP (DT a) (NN change)) (PP (IN in) (NP (NP (DT the) (NN body) (POS 's)) (JJ physiological) (NN condition))))) (CONJP (RB rather) (IN than)) (VP (VBG reversing) (NP (PRP it)))) (. .)))