Four Japanese scientists have been recognized with prestigious U.S. Lasker Awards. One of the scientists was honored for his research on a brain chemical that regulates sleep. A group of three scientists received the award for their work on an antibody therapy for patients with hemophilia A.

The Lasker Awards acknowledge significant contributions to medical science. Details of the scientists' work and the awards are available from the source.

Further information on the winners and their achievements can be found in the original report, which provides a more in-depth look at their research and contributions to the field of medical science.