REAGENT or RESOURCE	SOURCE	IDENTIFIER
Antibodies
Rabbit anti-Phospho-Myosin Light Chain 2 (Ser19)	Cell Signaling Technology	Cat # 3671; RRID: AB_330248
Mouse anti-E-cadherin	BD Biosciences	Cat # 610181; RRID: AB_397580
Alexa Fluor 488 goat anti-rabbit IgG (H + L)	Thermo Fisher Scientific	Cat # A11029; RRID: AB_2534088
Alexa Fluor 546 goat anti-rabbit IgG (H + L)	Thermo Fisher Scientific	Cat # A11030; RRID: AB_2534089
Chemicals, peptides, and recombinant proteins
Dextran, Alexa Fluor™ 488; 10,000 MW	Thermo Fisher Scientific	Cat #D22910
Dextran, Alexa Fluor™ 568; 10,000 MW	Thermo Fisher Scientific	Cat #D22912
Dextran, Alexa Fluor™ 647; 10,000 MW	Thermo Fisher Scientific	Cat #D22914
Alexa Fluor™ 488 Hydrazide	Thermo Fisher Scientific	Cat # A10436
Phenol red solution	Sigma-Aldrich	Cat #P0290
Y27632	Nacalai Tesque	Cat # 08945
Methylhydrogen silicone fluid (KF-99)	Shin-Etsu Silicone	Cat # KF-99-1
Experimental models: Organisms/strains
Wild type and albino Xenopus laevis frogs	Hamamatsu Seibutsu Kyozai, Watanabe Zoushoku	N/A
Software and algorithms
ImageJ/Fiji (ver. 1.53t)	Schindelin et al.	RRID: SCR_002285
GraphPad Prism 8 (ver. 8.4.3)	GraphPad Software	RRID: SCR_002798
Leica Application Suite X (ver. 3.5.7)	Leica Microsystems	RRID: SCR_013673
Labchart 7	ADInstruments	RRID: SCR_001620
Other
Aluminum foil (d: 5 μm)	Nilaco	Cat # AL-013131
Tungsten wire (φ: 30 μm)	Nilaco	Cat # W-461097
950Ag wire (φ: 0.4 mm)	Comokin	N/A
Glass capillary	Narishige	Cat # GC-1
FluoSpheres™ Size Kit #2, Carboxylate-modified Microspheres, yellow-green fluorescent (505/515), 2% solids, six sizes	Thermo Fisher Scientific	Cat #F8888