请用更地道、更科学、更书面化的英语表达如下内容：Experiments were performed with HUVECs cultured in Endothelial Cell Medium ECM Promocell Heidelberg Germany up to passage 6
The experimental procedures involved the utilization of Human Umbilical Vein Endothelial Cells (HUVECs) cultured in Endothelial Cell Medium (ECM) obtained from Promocell, located in Heidelberg, Germany. The HUVECs were cultured up to passage 6 before being subjected to further experimentation.
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