Figure 3.

Expression of Delta1 mRNA in the chicken inner ear sensory epithelia. Cells expressing Delta1 mRNA (black) are shown. Hair cells (arrows) in the untreated utricle (A) and drug-damaged basilar papilla at 3 days postgentamicin (B) contain high levels of Delta1 mRNA. Arrowhead points to stereocilia at the luminal surface. Postmitotic sister pairs (arrowheads) in the untreated utricle (C) and drug-damaged basilar papilla at 3 days postgentamicin (D) have equal, high levels of Delta1 mRNA. (Scale bar = 5 μm.) [Reproduced with permission from ref. 79 (Copyright 1999 The Company of Biologists Limited).]