Safety, Tolerability and Pharmacokinetics of NN1731 in Healthy Volunteers

Inclusion Criteria: * Japanese male subjects, who are considered to be generally healthy based on assessment of medical history, physical examination and clinical laboratory data at screening, as judged by the Investigator or Sub-investigator * Body Mass Index (BMI) between 18.0 and 27.0 kg/m\^2 (inclusive) Exclusion Criteria: * Any clinical laboratory values deviated from the reference range at the laboratory (except for cases within physiological change) or any abnormal electrocardiogram (ECG) findings at the screening, as judged by the Investigator or Sub-investigator * Presence or history of cancer or any clinically significant cardiac, respiratory, metabolic, renal, hepatic, gastrointestinal, endocrinological, dermatological, venereal, haematological, neurological, or psychiatric diseases or disorders * Evidence of clinically relevant pathology or a potential thromboembolic risk as judged by the Investigator or Sub-investigator * Presence or history of atherosclerosis, arteriosclerosis or thromboembolic events * Any past history of migraine * Overt bleeding, including from the gastrointestinal tract