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What is the meaning of ", an important step forward" in the following sentences,

The antibody was developed in collaboration with two research groups in the US. The team has now established that the antibody can neutralize a lab variant of the virus, an important step forward in the development of a potential antiviral drug against the new coronavirus.

( Source: VIB achieves important milestone in the development of a COVID-19 drug )

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Does "The team has now established that the antibody can neutralize a lab variant of the virus, an important step forward" mean "The team has now established that the antibody can neutralize a lab variant of the virus. And that the antibody can neutralize a lab variant of the virus is an important step forward" ?

Does "," in ", an important step forward" mean "and that the antibody can neutralize a lab variant of the virus is" ?

If so, after a ",", I have often seen sentences without conjunctions, subjects and verbs. In this cases, does "," imply the meaning of conjunctions, subjects, and verbs?

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The discovery or establishment "that the antibody can.." is the important step forward.

Same as 'a step forward' is important to a baby learning to walk. It's progress.

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