Ivanenkov V V
Biochem Genet. 1980 Apr;18(3-4):365-75. doi: 10.1007/BF00484249.
Tissue and cell differences have been found in the expression of allelic carboxylesterase-2 (E-2) (carboxylic ester hydrolase, E.C. 3.1.1.1) genes of the loach. The relative activity of two allozymes in the brain and muscles of heterozygotes is similar, whereas in oocytes and eggs of the same fish the activity of one of the allozymes is considerably greater than that of the other. Oocytes and eggs of some heterozygotes were shown to be heterogeneous for the expression of E-2 alleles. The phenomenon implies that roe produced by a heterozygous female can contain two or more egg types: in some the alleles are equally expressed, while in others one of the alleles is predominantly expressed.
已发现泥鳅等位基因羧酸酯酶-2（E-2）（羧酸酯水解酶，E.C. 3.1.1.1）基因在组织和细胞中的表达存在差异。杂合子大脑和肌肉中两种同工酶的相对活性相似，而在同一条鱼的卵母细胞和卵子中，其中一种同工酶的活性明显高于另一种。一些杂合子的卵母细胞和卵子在E-2等位基因的表达上表现出异质性。这一现象意味着杂合子雌鱼产生的鱼卵可能包含两种或更多种卵类型：在某些卵中，等位基因表达相等，而在另一些卵中，其中一个等位基因占主导表达。
