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Developing new implant materials to promote vascular regeneration has become a focus of the research. Researchers involved in the collaborative study decided to investigate the role of a key protein in growth of new blood vessels known as Dickkopf-3 (DKK3).

Ding said his company will not rush to come up with models, because what his team wanted to build were "next-generation smart mobility tools".

Discussion Cards for Amazon’s FreeTime service. (Amazon Photo)

Developed in 2017 by Bytedance, a Chinese internet tech company, TikTok is currently one of the most popular social media apps worldwide. In 2018, it ranked as the world's fourth most downloaded nongame app, after WhatsApp, Messenger and Facebook. Till February this year, its global downloads hit 1 billion, according to app analytics site Sensor Tower.

Didi will continue to work with global communities and partners to offer more innovative mobility services, and expand smart urban transportation programs to build an efficient and sustainable global mobility ecosystem, the company said in a statement.