General Structure Information 1g88 SMAD4 s4afl3arg515 mutant 3.0Å AUTH B.M.CHACKO,B.QIN,J.J.CORREIA,S.S.LAM,AUTH 2 M.P.DE CAESTECKER,K.LINTITL THE L3 LOOP AND C-TERMINAL PHOSPHORYLATION JOINTLYTITL 2 DEFINE SMAD PROTEIN TRIMERIZATION.REF NAT.STRUCT.BIOL. V. 8 248 2001REFN ISSN 1072-8368PMID 11224571DOI 10.1038/84995 Variant Set Distributions Ripley’s K Analysis Plots Variant Set Comparisons Mapped Variants