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. 2021 Jul 8;11:14091. doi: 10.1038/s41598-021-93512-1

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Rescue of htl mutant using Opto-htl. Tin positive heart cells in (A) wild-type and (B) htl homozygous mutant embryo. Tin is expressed in four cardioblasts per hemisegment (brackets) and in a subset of pericardial cells in OreR. Arrows show residual Tin-positive cells in a homozygous htl mutant embryo which fails to develop a heart. (C) twi::Gal4 > Opto-htl is expressed against htl null background and embryos illuminated and stained with Tin antibody. Two homozygous mutants are compared under dark and light conditions for Tin-positive cells. Arrows indicate Tin positive cells of the heart specified on the dorsal side of the embryos. (D) Quantification of the number of Tin-positive cells of the heart at stage 16 under dark and light conditions for embryos described in (C). Scale bar = 50 mm. A = Anterior, P = Posterior, D = Dorsal, V = Ventral view. In (D), the black bar on the right represents the 95% confidence interval with the Bootstrap distribution shown in orange⁶⁹.