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Senior Red Blood Cell AA5100
SenpaiManga
 JAPANESE NAME 先輩赤血球
 ROMANJI Senpai Sekkekkyū
CHARACTER STATUS
 STATUS Active
 GENDER Female
 SPECIES Red Blood Cell
 OCCUPATION Transporter
DEBUT
 ANIME DEBUT Episode 2
 MANGA DEBUT Chapter 3
VOICED BY
 JAPANESE Aya Endō

AA5100, Senior Red Blood Cell (先輩赤血球 Senpai Sekkekkyū?) is a minor character in Cells at Work!

She is a older red blood cell with decent working experience in the blood vessels. She sometimes guides and teaches AE3803 how to do her job when she is confused or lost.