Table 2.

Concentrations of cytokinin (CK) forms detected extracellularly in the untreated HeLa supernatants (nmol/L) and intracellularly within the corresponding cell pellets (pmol/10⁶ cells). Presented values are means ± SE (n = 3). A separate ANOVA was performed for each CK form for the supernatant samples with time as the dependent variable followed by Tukey's post hoc analysis

Sampling time (h)	CK concentration (nmol/L, supernatant; pmol/106 cells, pellet)
	iP	iPR	2MeSZ	2MeSiP	2MeSZR	2MeSiPR	iPRP
24	0.48 ± 0.02b	0.03 ± 0.01NS	0.29 ± 0.03b	0.41 ± 0.30NS	0.03 ± 0.02NS	n.d.	n.d.
48	0.61 ± 0.04b	0.05 ± 0.01	0.34 ± 0.10b	0.56 ± 0.39	0.12 ± 0.12	0.10 ± 0.02NS	n.d.
72	1.67 ± 0.05a	0.10 ± 0.05	2.17 ± 1.86a	1.34 ± 0.64	0.95 ± 0.89	0.20 ± 0.08	n.d.
Pellet (72)	0.02 ± 0.003	0.05 ± 0.02	0.12 ± 0.04	0.08 ± 0.02	0.02 ± 0.02	0.13 ± 0.04	0.34 ± 0.14

Values with the same letters are not significantly different (P < 0.05).

NS indicates lack of significant difference in CK concentrations between all time points.