Protocol for generation and assessment of head-like structure in zebrafish.

In vitro embryonic analogue models, such as gastruloids, trunk-like structures and embryoids, have been developed to understand principles of early development and morphogenesis. However, models that can fully mimic head formation are still missing. Here, we present a protocol for generating the head-like structure (HLS) in zebrafish embryonic explants. We describe steps for dissection and constructing cell and patterning landscapes. We then detail assessment of this structure through axis induction. For complete details on the use and execution of this protocol, please refer to Cheng et al. (2023).1.