non-toxicity

cyclo(L-Pro-L-Tyr) 是真菌和细菌的次生代谢产物。

The leguminous shrub,Leucaena leucocephala(Leucaena) is wide‐spread in tropical and subtropical agricultural systems and provides a ready source of protein for livestock. However, the presence of mimosine, a non‐protein, amino acid comprising about 12% of the dry matter in growing tips ofLeucaena, is toxic to animals. Mimosine is degraded rapidly in the rumen to produce 3,4‐dihydroxypyridine (3,4‐DHP) and 2,3‐dihydroxypyridine (2,3‐DHP), both of which remain toxic to animals[1]. 3,4-DHP, as a derivative of the plant amino acid mimosine, is goitrogenic in cattle, sheep, and mice. In contrast to established antithyroid compounds, such as methimazole (MMI) and propylthiouracil (PTU), 3,4-DHP has no SH-group. 3,4-DHP with various concentrations inhibited incorporation of125I into protein in human thyroid slices. It also suppressed the activation of lymphocytes by PHA (phytohaemagglutinin) and PWM (pokeweed mitogen). Suppression with 3,4-DHP was seen at 100 and 1000 μmol/L (P< 0.001 vs both PHA and PWM). Those, together with a very low murine bone marrow toxicity, probably related to the absence of an SH-group, make 3,4-DHP a potential antithyroid drug[2].

Ac-Val-Gln-aIle-Val-aTyr-Lys-NH2 是一种血清稳定化合物，能够选择性地抑制 tau 蛋白的纤维化，并且对神经细胞无毒。

Tet-20是一种合成导管素衍生的生物活性肽。此化合物作为医疗器械抗感染涂层的测试表明，它固定于植入物表面后，在体内和体外均展现了广泛的抗菌活性，能有效抑制生物膜的形成，且对真核细胞无毒。

Peptide A5K acetate(INF7-A5K-TAT acetate)是一种源自HA2-TAT融合支架的两亲性多肽，用于促进基因组编辑中的大分子转运。Peptide A5K acetate能与CRISPR RNP（核糖核蛋白复合物）非共价结合并递送至细胞中，如原代人T细胞、B细胞和NK细胞等，实现低毒、多重、高效、精确的基因组编辑。