Sterile distilled <e1>water</e1> was put inside the fifth <e2>well</e2> to serve as negative control while gentamicin was used as positive control in the fourth well.
Sterile distilled water was
Sterile distilled water was put inside the fifth well to serve as negative control while gentamicin was used as positive control in the fourth well.
<triplet> water <subject> well <object> Entity-Destination(e1,e2)