Thyroid hormone regulates lateral line development in zebrafish. A, Number of cranial neuromasts, as a function of SL, with comparison to Danionella priapus (orange square) and Danionella translucida (blue triangle) adults. For zebrafish, developmental trajectory is shown in solid line for WT and dashed line for TH−. Developmental trajectory is shown in solid line with purple SE for WT zebrafish and dashed line with green SE for TH− zebrafish. For comparison between graphs, gray stripes highlight period from 6 to 6.4 SL, during which TH availability is elevated. B-E, Same as (A) for number of trunk neuromasts, total number of neuromasts (head + trunk), cranial neuromasts divided by head length, and trunk neuromasts divided by trunk length. SL, standard length; TH−, hypothyroid; WT, Wild-type