(R)-lactate(in) + (S)-malate(out) <=> (R)-lactate(out) + (S)-malate(in)
(r)-lactate(in) + (s)-malate(out) <=> (r)-lactate(out) + (s)-malate(in)
(R)-lactate(in) + (S)-malate(out) <=> (R)-lactate(out) + (S)-malate(in)
(r)-lactate(in) + (s)-malate(out) <=> (r)-lactate(out) + (s)-malate(in)