Abstract
In previous papers (Yamada (1), (2), (3)), the fine structure of the centriole and its associated structure in the interkinetic cell of various types (white blood cell, megakaryocyte, ovarian follicular and interstitial cell) were described. Almost simulteniously and independently, Bernhard and De Harven (4), (5) reported similar finding in other cell types. Recently, Amano et al, presented the papers about the same subject (6), (7), (8). They offered, however, the assumption that the centriole within the mitotic cell shows somewhat different finding from that of the interkinetic cell. This paper presents the evidence that the centriole found in the mitotic cell shows the same strucLure with that of interkinetic cell and in this connection, it confirms the reports by Porter (9) and by Bernhard et al.(4), (5).

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