translation.en: And what was remarkable about it was in the past when we think of chemical messengers within the body, we thought of complicated things like estrogen and insulin, or nerve transmission.
translation.zh: 它与众不同的是 过去当我们想到体内的化学信使时， 我们会想到一些复杂的诸东西，如雌激素、胰岛素、 或神经传导。