In addition, there are some amino acid residues of glutamates, aspartates, histidines and methionines in matched peptides for these seven proteins, which were reported to bind with lead easily. 另外,与这7个铅结合蛋白所匹配的肽段中,含有较多的谷氨酸、天冬氨酸、组氨酸和甲硫氨酸,研究发现这些氨基酸残基易与铅结合。