Yanjun Li

SparseSeg improves cryo-vEM segmentation with sparse annotations by using exemplar-driven propagation and multi-kernel U-Net for accurate, context-aware organelle detection.

The paper shows that δ-cell interactions modulate pancreatic islet Ca2+ oscillation patterns through somatostatin secretion and pharmacological/optogenetic perturbations, revealing a Hopf bifurcation mechanism.

The paper shows that pancreatic α and β cells exhibit globally phase-locked Ca2+ oscillations with tunable phase shifts that set islet oscillation patterns.