Page 73 - PG 101-Course notes مذكرة النظري 24-25 with spec
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Medicinal plants (PG 101) Level 1 Clinical Pharmacy-PharmD
3. Companion cells:
- Living and narrower than sieve tubes.
- Has nucleaus and abundant cytoplasm.
- Thin walled
- When sieve tube loses its function the companion cells die as well.
- One or several may be associated with the sieve tube.
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