The best replacement for gap junctions is tight junction.

The best alternatives to gap junctions are rated as following:
★★★★★  tight junction
★★★★  desmosomes
★  tight junctions

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Speaking about gap junctions, one probably shouldn't forget about muscles.

Other search terms related to gap junctions and their ratings are:
★★★★★ muscles
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gap junctions
tight junction
desmosomes