Agarose gel electrophoresis and DNA sequencing had proved that the fusion plasmid by using the ECHO system contained the gene sequence of HGH with intron.

• 由琼脂糖凝胶电泳和序列测定证实,用ECHO克隆系统构建的融合质粒中,确实含有人生长激素带内含子的基因序列。