【单选题】【消耗次数：1】
实验动物新生期切除胸腺后，淋巴结内（ ）
①
深皮质区缺乏T细胞
②
生发中心生成受影响
③
胸腺依赖区T细胞数目和生发中心均不受影响
④
深皮质区T细胞缺乏，同时生发中心形成也受影响
⑤
浅皮质区无明显影响
参考答案：
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