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. 2021 Apr 21;19:114. doi: 10.1186/s12951-021-00852-1

Fig. 1.

Fig. 1

Possible sources of human fluids for fluid-based analysis. Apart from the common sources of serum and urine, several other types of body fluid can be extracted, including tears, intraocular fluid, nasal fluid, sweat, breast milk, semen, vaginal fluid, spinal fluid, and joint fluid