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There is a mucus coat on top, with gut cells right under it

PMID 4139704

For detailed guidance on bacteriostatic water and peptides , researchers should understand that the 0.9 percent benzyl alcohol concentration is both effective for preservation and well-tolerated at typical injection volumes

Specifications Summary Precautions & Notes Experimental behaviour of Epithalon is dependent on concentration, exposure duration, and experimental model Buffer composition, pH, and ionic strength may influence peptide stability and assay performance Literature reports are derived from heterogeneous experimental systems and should be interpreted accordingly Appropriate controls are recommended to distinguish specific from non-specific effects Intended strictly for laboratory research use

Conclusion It appears necessary to rethink endometriosis candidate biomarkers research by designing studies that can be integrated at different levels: i) local and systemic biological compartments