When a molecule of tryptophan absorbs ultraviolet light, it glows faintly as it releases energy at a lower frequency. This effect, called fluorescence, is well known. But something extraordinary ...

When a molecule of tryptophan absorbs ultraviolet light, it glows faintly as it lets off lower-frequency energy. This soft glow, known as fluorescence, is a familiar effect. But when many tryptophan ...