. 2015 Jan 13;5:7749. doi: 10.1038/srep07749

Table 1. Cytogenetic analysis did not reveal any difference between non-irradiated and THz-irradiated human embryonic stem cells.

		Number per 100 cells, ±SEM^a (absolute number)
Treatment	Number of cells scored	Cells with aberrations	Chromosome-type aberrations	Chromatid-type aberrations
THz beam, repeats 1 and 2	475	2.3 ± 0.7 (11^b)	0.6 ± 0.4 (3)	2.1 ± 0.7 (10)
Control, repeats 1 and 2	430	2.1 ± 0.7 (9^b)	0.2 (1)	2.3 ± 0.7 (10)

a - SEM, standard error of the mean; THz, terahertz.

b – some cells contained more than one aberration, and the number of cells with aberrations was not equal to the sum of chromosomal aberrations.