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"h"外显子的半部分，位于基因的3'端，被反向转录方向插入了诺卡因载体。对各基因型小鼠产生的B细胞提取物进行 Western blot 分析，结果显示该蛋白在纯合子小鼠中不表达。 (Source: The h exon in the gene was replaced with a neomycin cassette in reverse transcription, and the protein expression was not detected in homozygous mice through Western blot analysis of B cell extracts.)