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. 2021 Feb 11;4:186. doi: 10.1038/s42003-021-01716-y

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Age distribution of major expanded TEs in the two penaeid shrimp genomes. According to previous studies⁵⁷, the substitution rate of decapods is 2 × 10⁻⁹ substitutions per site per year. b Percentage of TEs harboring SSRs in the two shrimp genomes. The SSRs located within TEs (hide bar) and 100 bp up- and downstream of TEs (orange and green bars) were counted separately. *Indicates significant difference (p < 0.05) of the TEs harboring SSRs between L. vannamei and F. chinensis. c Comparison of ancient and recent TEs that carrying SSRs. d Distribution of the number of TEs containing variable lengths of SSRs. Two peaks representing short and long SSRs were identified in the curve plot. e Comparison of TEs containg short and long SSRs. The stars indicate the significant differences with p < 0.05. The short and long SSRs were selected according to a curve plot of the numbers of TEs with different SSR lengths (Supplementary Fig. 19). Since a single peak (representing short SSRs) was observed in the length distribution of (AAT)_n, long (AAT)_n SSRs were considered those with lengths longer than 35 bp. f Comparison of SSR density in various TEs of F. chinensis and L. vannamei. A positive value of log₂(Density_Fch/Density_Lva) indicates that the SSR density in correspondent TE was higher in F. chinensis than L. vannamei, and verse versa. g Synteny of recently transposed TEs (Penelope). SSR elongations and new insertions (green circle) were identified in the transposed TEs.