TABLE 1.

Mg/P/Ca atomic ratios within type II inclusions formed by strain XQGS-1 cells versus polyphosphate formed by cyanobacteria^a

	Atomic ratio
Inclusion	Mg Kα	P Kα	Ca Kα	Ca/P ratio
Type II inclusion 1	4.92	31.38	63.7	2.03
Type II inclusion 2	2.41	33.92	63.67	1.88
Type II inclusion 3	0.84	38.37	60.79	1.58
Type II inclusion 4	0	31.59	68.41	2.17
Type II inclusion 5	5.65	40.11	54.24	1.35
Type II inclusion 6	0	23.08	76.92	3.33
Type II inclusion 7	2.03	30.56	67.41	2.21
Type II inclusion 8	9.78	55.75	34.47	0.62
Type II inclusion 9	2.01	21.09	76.9	3.64
Type II inclusion 10	0	51.38	48.62	0.95
Avg	2.76	35.73	61.51	1.72
Polyphosphate 1	14.63	68.73	16.64	0.24
Polyphosphate 2	14.28	67.93	17.79	0.26
Polyphosphate 3	19.31	64.30	16.39	0.25
Polyphosphate 4	18.91	64.99	16.10	0.25
Polyphosphate 5	17.87	65.20	16.93	0.26
Polyphosphate 6	16.34	66.79	16.87	0.25
Polyphosphate 7	17.49	67.46	15.05	0.22
Polyphosphate 8	16.31	66.91	16.78	0.25
Avg	16.9	66.5	16.6	0.25

^aSee reference 30. Positions of type II inclusions on STEM-HAADF images are shown in Fig. S5 in the supplemental material. Kα, the X ray is emitted when vacancy in K-shell is filled by a transition from L-shell.