immunoglobulin light chain variable region fragment [Homo sapiens]

免疫球蛋白轻链可变区片段序列为Phe-Thr-Leu-Lys-Ile-Ser-Arg，是人免疫球蛋白轻链的可变区的片段。

免疫球蛋白（Ig）是B细胞的抗原识别分子。Ig分子是由2条相同的重链和2条相同的轻链通过二硫键连接，每条重链与对应轻链连接，2条重链连接在一起。每个轻链均有一个可变区和恒定区。可变区的作用是结合抗原。

一条重链的和一条轻链的可变区组成抗体的抗原结合位点。典型的轻链可变区包括105到110个氨基酸，某些位点表现出较多的序列可变性。可变片段是对IgG和IgM类抗体进行酶裂解所得到的最小片段。

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