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The concept of the niche
Bone marrow female donors
Endometrial cells of
donor origin in the mismatched recipient endometrium
Gargett et al. Molecular and Cellular Endocrinology 2008
Adequate Endometrium. Definition Not clear
 Classically, endometrial trilaminar sonographic pattern of ≥8mm the day of the hCG triggering
However, good PR have been reported with ≥ 6mm in Natural Cycle
Pregnancies have been reported with endometrium < 5mm and even 3.7mm (Cruz et al.)
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Taylor. JAMA 2004
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