黄色荧光蛋白（Yellow Fluorescent Protein ，YFP）可以看做绿色荧光蛋白的一种突变体，最初来源于维多利亚多管水母（ Aequorea victoria）。相对于绿色荧光蛋白，其荧光向红色光谱偏移，而这主要是由于蛋白203位变为。其更大激发波长为514 nm，更大发射波长为527 nm。

常用黄色荧光蛋白： Citrine, Venus, and Ypet。这三种改良的蛋白荧光更亮，更稳定，而且成熟更快，因此应用广泛。

上图：YFP在小鼠上的表达（析浦荧光手电筒GFPfinder-2101观察效果）

yfp激发光和发射光波长

Hyperfolder YFP is a basic (constitutively fluorescent) green/yellow fluorescent protein published in 2022, derived from Aequorea victoria. It is reported to be a rapidly-maturing weak dimer with moderate acid sensitivity.

上图为Hyperfolder YFP的激发光和发射光波长光谱图

Superfolder YFP is a basic (constitutively fluorescent) green/yellow fluorescent protein published in 2005, derived from Aequorea victoria.

mCitrine is a basic (constitutively fluorescent) yellow fluorescent protein published in 2002, derived from Aequorea victoria.

mCitrine YFP的激发光和发射光波长光谱图

mVenus is a basic (constitutively fluorescent) yellow fluorescent protein published in 2006, derived from Aequorea victoria. It is reported to be a rapidly-maturing monomer with moderate acid sensitivity.

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上图为mVenus的激发光和发射光波长光谱图

YPet is a basic (constitutively fluorescent) yellow fluorescent protein published in 2005, derived from Aequorea victoria. It has moderate acid sensitivity.

上图为YPet的激发光和发射光波长光谱图

析浦（上海）科学仪器有限公司生产的便携式荧光手电筒GFPfinder-2101CY能够激发Citrine, Venus, and Ypet等黄色荧光蛋白YFP在植物愈伤、叶片、种子、根系以及各种模式动物上的表达荧光，有手电筒式的荧光手电筒，也有手持式双波长荧光观测灯，也有台式和体视显微镜配套使用的荧光适配器，：