密度标记 density label 系指用重氢（2H或D）、重氮（15N）、重碳（13C）等稳定同位素或它们的类构体〔例如：用5-溴尿嘧啶（5-bromouracil）代替胸腺（thymi-ne）〕进行标记以产生高密度分子的方法。因为利用密度差可以与普通分子分开，因而被应用于生物体内物质的合成和代谢过程的研究。
采用免疫组化法检测60例肝癌组织及癌旁肝组织中vegf及MMP - 2的表达，用CD 34标记免疫组化法检测微血管密度(MVD)。
Immunohistochemistry was used to determine the expression of VEGF, MMP-2 in 60 HCC tissues and cancer adjacent tissues, and microvessel density (MVD) was detected with labelled CD34.
本研究的平均图距还较大，有待于进一步深化，以期构建出一张标记分布均匀，位点密度较高的长果种黄麻遗传连锁图谱。
In this study, the average map distance is too large, which requires to be further deepened for building a genetic linkage map of Jute with evenly-distributed markers and high-density sites.
采用计算机模拟方法系统比较了目标数量性状的遗传力和标记密度对F2设计下单个性状数量性状座位（QTL）区间定位效果的影响。
The effects of interval mapping for quantitative trait loci(QTL) of single trait under different heritabilities and marker densities in a F2 population were compared by computer simulation.
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