Table 3 Collagen peptide markers used to make the ZooMS identifications of the experimentally contaminated Hollis bone samples and two Palaeolithic samples (2 IST EW 1920 and 38 IST 11 1934) after undergoing different radiocarbon dating cleaning methods.

Original sample number	Lab number	Extraction method	ZooMS ID	Collagen peptide markers
Original sample number	Lab number	Extraction method	ZooMS ID	P1	A1	A2	B	C	P2	D	E	F1	F2	G1	G2
			Elephant/Mammoth	1105	1145	1161	1453	1579	1556	2115	2808	2853	2869	2999	3015
			European rabbit	1105	1221	1237	1453	–	–	2129	–	2883	2899	2957	2973
Hollis bone	MUSE20026.41	RC cleaning method 1	Elephant/Mammoth	1105	–	–	1453	–	–	2115	–	–	–	–	3015?
Hollis bone	MUSE20026.40/41_ABA	RC cleaning method 2	Elephant/Mammoth	1105	–	1161	1453	–	–	2115	–	2853	–	2999	3015
Hollis bone	MUSE20026.48	RC cleaning method 1	Elephant/Mammoth	1105	1145?	1161	1453	–	–	2115	–	2853	–	2999	3015
Hollis bone	MUSE20026.49	RC cleaning method 1	Elephant/Mammoth	1105	–	–	1453	–	–	2115	–	2853	2869?	2999?	3015
Hollis bone	MUSE20026.48/49_ABA	RC cleaning method 2	Probable Elephant/Mammoth	1105	–	–	1453	–	–	2115	–	2853?	–	–	–
2 IST EW 1920	MUSE21164	RC cleaning method 2	Sperm whale/Bos	1079/1105	–	–	1453/1427	–	1652/1648	2133/2131	–	2883	–	3023?/3017?	3039/3033
38 IST 11 1934	MUSE21169	RC cleaning method 2	Sperm whale	1079	–	1208	1453	–	–	2133	–	2883	–	–	3039?

Hollis sample MUSE20026.44/45_ABA is not listed as it provided poor quality spectra resulting in no identification. The first two rows are previously published Elephant/Mammoth and European rabbit reference markers. Peptide markers in bold are the cattle-collagen glue markers. No unique markers (those not shared with the species of origin) were observed for the experimental rabbit glue in the Hollis bone samples. ? indicates that the marker was likely present however it was below the m/z threshold or in an area of poor resolution; –indicates no marker was present.

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