R-spondins: Multi-mode WNT signaling regulators in adult stem cells
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R-spondins (RSPOs) are secreted cysteine-rich glycoproteins that belong to a superfamily of thrombospondin type 1 repeat-containing proteins. RSPOs together with WNT proteins potentiate canonical WNT/β-catenin signaling activity. Over the last several years, ... ...