Scientists have made a discovery that could lead to improved treatment for asthma sufferers.
They have found that blocking a certain signalling molecule can alleviate symptoms such as mucus production, swelling (edema), and constriction of the airways in the lungs.
The international study, led by Dr Stephan Caucheteux, from Cardiff University's School of Medicine, believes their work could ultimately help asthma sufferers around the world.
Some 5.4m people in the UK are currently receiving treatment for asthma, including more than a million children.