PMC:7796369 / 930-1134 2 Projects
Annnotations
| Id | Subject | Object | Predicate | Lexical cue |
|---|---|---|---|---|
| T9 | 42-44 | Sentence | denotes | 1. |
| T10 | 45-57 | Sentence | denotes | Introduction |
| T11 | 58-176 | Sentence | denotes | Since the COVID-19 pandemic started, efforts for vaccine development and production began in many different countries. |