During experiment , acetylcholine shows significant inhibitory effects on the settlement and metamorphosis of ascidian larvae , but its concentration cannot lower 1 x 10 - 7mol / l . similarly acetylcholine , y - aminobutyric ( gaba ) and picrotoxin also can inhibit the settlement and metamorphosis of s . canopus larvae 实验中，乙酰胆碱对冠瘤海鞘的附着变态表现出抑制作用，但当浓度降低到10 ~ ( - 7 ) mol l时，此作用已不明显。
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