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The hydrogels and cells growing on them. (I) The FTIR spectral characteristics for the two hydrogels Collagen/mucin-HG and Collagen/mucin/polyP-HG in comparison to Mg-polyP-NP. In the mucin gel, the characteristic polyP signals (PO2, PO3 and P–O–P) are missing. (II) Growing of A549 cells onto the gels in 24-well plates (C) and staining of the cells with calcein; (A) Collagen-HG (incubation for 2 days), (B,E) Collagen/mucin/polyP-HG (1 day or 2 days), or (D) Collagen/mucin-HG (2 days).
