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Image Title: Ontogenetic sequence of primary xylem elements.
Image Credit: Katherine Esau, Jennifer Thorsch
Intended End User: Teacher, Student
License Details: BSA - Terms for Image Use
Copyright held by: Katherine Esau and Jennifer Thorsch, BSA
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About the Image

Ontogenetic sequence of primary xylem elements (from bottom to top) with annular secondary wall thickenings (rings) gradating to helical thickenings in a moderately stretched cell.

National Science Foundation  Development Supported by the National Science Foundation