An interaction between neighbouring cells.
D000818:Animals; D002244:Carbon / Q000378:metabolism; D002455:Cell Division; D006224:Cricetinae; D046508:Culture Techniques; D006367:HeLa Cells; D011830:Radiation Effects; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
D014316:Tritium; D002244:Carbon; D013936:Thymidine