Ca/Mg atomic ratio of polyphosphates in strains forming intracellular ACC (left) vs. strains not forming intracellular ACC (right). The dataset includes the Ca/Mg ratios of 136 polyphosphates from ten strains forming intracellular ACC and 133 polyphosphates from six strains not forming intracellular ACC. The Ca/Mg values of the polyphosphates were calculated based on STEM‐EDX analyses. The bold lines indicate the median values; the boxes span the second and third quartiles; the vertical dashed lines span 1.5 times the extent of the boxes. Open circles are outliers, which are Ca/Mg measurements above the vertical dashed lines. The Wilcoxon–Mann–Whitney statistical analysis shows a significant difference between the two groups *** p < 0.001

source: De Wever, A., Benzerara, K., Coutaud, M., Caumes, G., Poinsot, M., Skouri‐Panet, F., Laurent, T., Duprat, E., and Gugger, M. (2019): Evidence of high Ca uptake by cyanobacteria forming intracellular Ca CO 3 and impact on their growth. Geobiology, 17(6), 676-690.