Table 1. Molecular Masses of SNAs S1–S6.

SNA	calculated molecular mass (kDa)	observed molecular mass (kDa)	hydrodynamic size (nm)
S1	27.6	27.8a	9.2 ± 1.2
S2	27.6	27.7a	9.6 ± 2.5
S3	61.2	62.6 ± 0.4b	11.8 ± 0.6
S4	107.3	106.8 ± 3.6b	16.2 ± 0.1
S5	109.9	109.3 ± 2.1b	19.0 ± 2.0
S6	113.2	107.4 ± 2.3b	21.4 ± 0.8

^aA hybrid quadrupole-orbitrap spectrometer with nano ESI-ionization was used for mass analysis (cf. Figure S12).

^bThe values were obtained by SEC-MALS-based estimation of the molecular mass (cf. Figure 2C).