神経 しんけい伝達 でんたつ物質 ぶっしつでしょう
shinkeidentatsubusshitsudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 神経伝達物質

1. Neurotransmitter, probably.; It will likely be a neurotransmitter.

Polite
Presumptive
Conjecture