求助，今天碰到一个句子，一时无法分析其语法结构。望高手指点！
Most malaria vaccines under development work by including genetically engineered versions of just a handful of the thousands of proteins of the Plasmodium parasite.
感激不尽！
(Most malaria vaccines under development主语) (work谓语) (by including genetically engineered versions of just a handful of the thousands of proteins of the Plasmodium parasite状语)
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