#感知環境中的光（不可見光譜）
#Sense Light (Non‑visible Spectrum) From the Environment
魚在黑暗中仍能看見東西 (The fish can see in the dark)
一種酶可以將維生素 A1 轉化為維生素 A2（稱為脫氫視黃醇）。維生素 A2 似乎將紅視錐細胞的敏感性轉移到更長的波長，使具有這種特殊酶的魚能夠看到近紅外光。
An enzyme that converts vitamin A1 to vitamin A2 (called dehydroretinol). Vitamin A2 appears to shift the sensitivity of red cone cells to longer wavelengths, allowing fish that have this particular enzyme to see near-infrared light.
