It is a freely available resource for research on handling negation and uncertainty in biomedical texts . The corpus consists of three parts, namely medical free texts,biological full papers and biological scientific abstracts. The dataset contains annotations at the token level for negative and speculative keywords and at the sentence level for their linguistic scope. The annotation process was carried out by two independent linguist annotators and a chief annotator – also responsible for setting up the annotation guidelines – who resolved cases where the annotators disagreed.