TASK DEFINITION: In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.
PROBLEM: Monoamine transporter and sodium channel mechanisms in the rapid pressor response to cocaine.

SOLUTION: sodium

PROBLEM: Alpha 1-adrenoceptor subtypes mediating the regulation and modulation of Ca2+ sensitization in rabbit thoracic aorta.

SOLUTION: Ca2+

PROBLEM: Identification and characterization of a novel flavin-containing spermine oxidase of mammalian cell origin.

SOLUTION:
spermine