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Table 2 Characteristics of migratory cell types. See Methods for abbreviations in table

From: Long-term time-lapse live imaging reveals extensive cell migration during annelid regeneration

Cell type Characteristics N Cell size (μm) Speed (μm/min) Total mean square displacement (μm2) Tangential trajectory speed (\( \nu \)) ALL / \( \nu \) < 100 Timescale of autocorrelation (\( \tau \)) ALL/\( \tau \) > 0.01
Eleocyte (Fig. 4a and b) • Large, round, with a globular cluster of granules.
• Found within coelomic cavity, single or in clusters attached to septa, gut, or chaetal sac muscles.
• Can “jump” after detaching from anchor points, or crawl along the peritoneal lining.
37 avg: 12.7 avg: 3.5 avg: 6882 min: 1.30 / 1.30 min: 0.00 / 0.05
rng: 9–19 med: 2.8 med: 1545 1stQ: 3.97 / 2.55 1stQ: 0.00 / 0.33
max: 33.9 max: 122,671 med: 6.99 / 4.63 med: 0.37 / 0.84
avg: 1716 / 5.50 avg: 2578 / 1.08
3rdQ: 951 / 6.99 3rdQ: 1.27 / 1.41
max: 16,210 / 18.64 max: 1.02e5 / 4.98
n: 37 / 25 n: 37 / 25
“Carrier” (Fig. 4c and d) • Medium size, variable irregular shape containing few to several granules.
• Found within coelom.
• Move by sliding and pseudopodial “walking”.
143 avg: 10.8 avg: 3.3 avg: 5167 min: 0.76 / 0.76 min: 0.00 / 0.03
rng: 7–18 med: 2.5 med: 871 1stQ: 3.75 / 3.04 1stQ: 1e-5 / 0.42
max: 20.1 max: 79,334 med: 6.91 / 4.86 med: 0.50 / 0.79
avg: 801 / 5.60 avg: 1.00 / 1.42
3rdQ: 568 / 7.10 3rdQ: 1.05 / 1.25
max: 14,730 / 48.74 max: 32.8 / 32.8
n: 143 / 101 n: 143 / 101
Amebocyte (Fig. 4e) • Large amoeboid cells containing usually 1–2 large granules, sometimes more or none.
• Found along the inner side of the body wall
• Crawl mostly on dorsal peritoneum by extending long pseudopodia, stretching as much as 50 μm or more.
90 avg: 17.0 avg: 2.9 avg: 12,007 min: 1.06 / 1.06 min: 0.00 / 0.14
rng: 8–30 med: 1.9 med: 3019 1stQ: 2.03 / 1.92 1stQ: 0.48 / 0.59
max: 33.0 max: 170,254 med: 3.66 / 2.81 med: 0.97 / 1.03
avg: 341 / 3.97 avg: 1.17 / 1.37
3rdQ: 7.16 / 4.92 3rdQ: 1.51 / 1.56
max: 9673 / 22.06 max: 6.35 / 6.35
n: 90 / 77 n: 90 / 77
Hyalinocyte (Fig. 4f and g) • Medium to large, round or oblong with smooth texture; no granules.
• Typically found along the inner side of the body wall
• No obvious motility structures, swing from an attached edge.
12 avg: 10.7 avg: 4.7 avg: 1518 min: 0.89 / 0.89 min: 8e-6 / 0.02
rng: 8–16 med: 2.7 med: 601 1stQ: 3.27 / 3.01 1stQ: 0.06 / 0.92
max: 11.3 max: 4586 med: 6.20 / 5.87 med: 1.06 / 1.18
avg: 113 / 6.25 avg: 1.11 / 1.34
3rdQ: 11.20 / 7.23 3rdQ: 1.64 / 1.70
max: 743 / 17.93 max: 3.73 / 3.73
n: 12 / 10 n: 12 / 10
“Roller” (Fig. 4h and i) • Medium size, round cells, with none, one or two granules.
• Found on coelomic cavity, in tangential contact with their substrate or detached.
• Move by rolling over the substrate aided by small filopodia.
94 avg: 8.6 avg: 4.9 avg: 3047 min: 0.87 / 0.87 min: 0.00 / 0.07
rng: 7–12 med: 4.7 med: 1555 1stQ: 5.66 / 5.23 1stQ: 0.28 / 0.57
max: 21.3 max: 24,365 med: 6.85 / 6.47 med: 0.71 / 0.92
avg: 1032 / 6.71 avg: 1.07 / 1.29
3rdQ: 9.42 / 7.45 3rdQ: 1.36 / 1.43
max: 26,140 / 21.27 max: 6.81 / 6.81
n: 94 / 78 n: 94 / 78
“Slider” (Fig. 4j and k) • Small to medium, spindle shaped cells, with no granules (rarely one).
• Large surface in contact with the substrate, often over ventral nerve cord or lateral peritoneum.
• Move by sliding over the substrate.
115 avg: 9.6 avg: 2.0 avg: 3071 min: 0.56 / 0.55 min: 0.00 / 0.04
rng: 6–16 med: 1.2 med: 887 1stQ: 1.36 / 1.28 1stQ: 0.09 / 0.75
max: 32.3 max: 66,262 med: 2.70 / 1.91 med: 0.86 / 1.22
avg: 432 / 2.57 avg: 1.38 / 1.79
3rdQ: 6.33 / 3.61 3rdQ: 2.17 / 2.48
max: 11,030 / 8.95 max: 6.98 / 6.98
n: 115 / 89 n: 115 / 89