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Few believed this technology had a future given the seemingly insurmountable immunity barriers and the fear of transmitting animal viruses to man. But progress in the biotechnologies has since brought some dramatic results.

I couldn't understand why they used "since" in this way?

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    Since the time that the technology was first invented. Dec 29, 2021 at 14:30

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The "progress in the biotechnologies" occurred after the time when "Few believed this technology had a future" (probably soon after the technology was developed). The word "since" is used to indicate that time sequence. A fuller form with the exact same meaning would be:

But progress in the biotechnologies has since then brought some dramatic results.

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