Nine days after take-off, Voyager landed smoothly at Edwards Air Force Base in California.

VOA: special.2010.10.06

What's hanging off of the side of this long molecule that's formed by polymerizing nucleotides are - is this base unit.

在这条由多聚核苷酸,构成的长链分子,一侧悬挂着碱基单位

耶鲁公开课 - 生物医学工程探索课程节选