它们对脊椎动物没有直接毒性作用。
结果NO对PC12细胞可以产生剂量依赖性的直接毒性作用，而缺氧预适应小鼠脑匀浆提取液能有效对抗NO神经毒性作用。
Results Nitric oxide was directly toxic to PC12 cells in a dose-dependent manner, and brain tissue homogenate extracts taken from hypoxia preconditioned mice could prevent PC12 cells from NO toxicity.
虽然氯联苯没有很强的直接制毒性，但是它们能长期存留在环境中，并积存在人体组织里。
Although PCBs have a low immediate toxicity, they are very persistent in the environment and accumulate in tissues over time.
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