Unripe lychee fruit contain a compound called hypoglycin, which is poisonous in large quantities. No amount of ripe lychee fruit, however, contains enough hypoglycin to harm human health. In response to recent deaths of consumers who ate unripe lychee fruit, scientists have recently developed an alternative type of lychee fruit, called lychee-B, that, ripe or unripe, contains no more hypoglycin than ripened, conventional lychees. Therefore, unripe lychee-B fruits are at least as safe to eat as
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