They are using synthetic polymer gels that expand and contract in response to small electrical currents to create synthetic muscles for replacing heart valves , sphincter muscles and , eventually , larger muscles .
There is no cure for cold sores , but some over-the-counter creams and gels can provide symptomatic relief of burning and pain .
目前对于疱疹没有治愈的方法,用非处方的乳剂或者胶体可以缓解烧灼感和疼痛感。
So in tissue engineering procedures , cells are applied to one of these scaffolds-which come in a variety of materials and forms , including sponges , meshes , films , and gels .