核糖体亚单位是核糖体由大、小两个亚单位组成。由于沉降系数不同，核糖体又分为70S型和80S型。70S型核糖体主要存在于原核细胞及叶绿体、线粒体基质中，其小亚单位为30S,大亚单位为50S;80S型核糖体主要存在于真核细胞质中，其小亚单位为40S,大亚单位60S.
与美国N C B I的网上基因数据库比较，发现这3 者又与萨尔瓦多等其他5 个间日疟原虫不同地理株的小亚单位核糖体核糖核酸相应基因片段完全一致。
Compared with data got from NCBI genbank, targeted SSUrRNA gene sequences of above mentioned 3 isolates were the same as those of other 5 different P. vivax geographical isolates .
研究表明，大环内酯类抗生素能与细菌核糖体50 s亚单位的L 2 7及L 2 2蛋白质结合，抑制细菌的蛋白合成而发挥抗菌作用。
Studies showed that macrolide antibiotics exert antimicrobial effects by binding to L27 and L22 protein of the 50s subunit of bacterial ribosomes and inhibiting protein synthesis.
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