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One moment there is nothing, the next ... a heartbeat! ❤️ #SaturdayMorning #saturdayscienceread #saturdayvibes #firstbeat #firstheartbeat
One moment there's nothing, the next... a heartbeat.
As a vertebrate embryo grows, its heart tissue starts to pulse well before it's actually needed. But how does the developing heart actually co-ordinate that very first beat?
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