(d) Scattering particle size.

Method(s)/software	PRIMUS/qt (ATSAS 3.1; Manalastas-Cantos et al., 2021 ▸) for M from Bayesian inference and V P, MULCh (Whitten et al., 2008 ▸) for ν, Δρ and M from chemical composition, equation (1) in Trewhella et al. (2017 ▸) for M from I(0)/c
	mCZ38BS	ZBTB38:mCZ38BS
Volume estimates (Å3)
Porod volume V P (ratio to M)	21100 (1.27)	53000 (1.54)
Molecular mass M estimates (Da)
From chemical composition	16632	34389
From c-independent method (Bayesian inference, range with % confidence)	15150–18350, 98%	35750–38950, 95%
From I(0)/c (ratio to expected)	18334 (0.91)	43100 (1.25)
Partial specific volume ν (cm3 g−1)	0.591	0.657 (ZBTB38 alone 0.718)
Contrast Δρ (1010 cm−2)	5.425	4.158 (ZBTB38 alone 3.182)
From SAS-independent measure	n.a.	n.a.