The implantation window may also be initiated by other preparations in the endometrium of the uterus, both structurally and in the composition of its secretions
ह्याची तुलना आपल्याकडील नगरराज्यांची करता येईल, परंतु व्याख्या आणि व्यवस्थेनुसार दोन्ही भिन्न ठरतात.