利用最大似然估计原理，给出了构建系统发生树的模型和算法。
A model and an algorithm were provided for constructing phylogenetic tree based on the principle of maximum likelihood estimate.
目的建立风疹病毒包膜糖蛋白e1的克隆载体；研究e1基因变异情况，并对其序列进行系统发生树分析。
Objectives to construct the cloning vector of glycoprotein E1 gene of rubella virus, to study the mutation of glycoprotein E1 gene, and to analyze the sequence of E1 gene by the phylogenetic tree.
系统发生树分析表明：卢龙毒株ll36755与其他已经报告的两种猪和一种人类的G5型毒株可能具有相同的起源。
Phylogenetic analysis showed Lulong strain LL36755 clustered together in the same lineage as two other reported porcine G5 rotavirus strains and one reported human G5 rotavirus strain.
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