The PDF file includes:

• Fig. S1. Labellar spread.
• Fig. S2. Mechanosensitivity in varied bristles and dendritic pattern of bitter GRNs.
• Fig. S3. Mechanosensitivity of GMR41E11-labeled bristle neurons.
• Fig. S4. Axonal projections and functions of labellar MSNs.
• Fig. S5. GMR58H01 neurons and bitter GRNs drive proboscis retraction.
• Fig. S6. GMR18B07 neurons drive labellar spread.
• Table S1. Expression patterns of different driver lines.
• Table S2. Full experimental genotypes.
• Legends of movies S1 to S7

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Other Supplementary Material for this manuscript includes the following:

• Movie S1 (.mp4 format). Labellar spread during natural feeding.
• Movie S2 (.avi format). Labellar spread by food contact of labella.
• Movie S3 (.mp4 format). Sweet GRNs do not drive labellar spread.
• Movie S4 (.mp4 format). Mechanical stimulation induces labellar spread.
• Movie S5 (.mp4 format). Three-dimensional reconstruction of a taste bristle.
• Movie S6 (.mp4 format). Labellar spread by bristle MSNs.
• Movie S7 (.mp4 format). Proboscis retraction by peg MSNs.