Commentary for Niddah 53:14
אחד נגמרה צורתו לסוף שבעה ואחד נגמרה צורתו לתחלת תשעה
since in such circumstances it is possible that the features of one embryo were completed at the end<span class="x" onmousemove="('comment',' Within a day or two. ');"><sup>13</sup></span>
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